Applet in ie 5.0: class can not be Instantiated

Hi!
My problem is an Applet, which works fine with the appletviewer and with my iExplorer 5.0.
But when I tried to install my Application (the Applet is part of a J2EE-WebApp) on the tomcat of an other computer, I get the
"class can not be instantiated"-Error and iE 5.0 only displays a grey box in the size of the Applet. With the appletviewer it works.
I got the same tomcat, same mySQL and same browser on both computers.
I also invoked the application running in tomcat on my computer from 2 other computers - on one of them, the Applet was shown, on the other, I only got this grey box.
The version of the iExplorer was exactly the same.
What can be wrong?

Are you sure there is a static method in the Applet class named newAudioChip that takes a URL as an argument?

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go to
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There are many possible causes for the error you are getting, for example:
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Load: AcidRainApplet.class can't be instantiated

The error "load: AcidRainApplet.class can't be instantiated" is coming up on this bit of code, any ideas on being rid of it?
// The "AcidRainApplet" class.
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import java.util.Date;
import javax.swing.*;
public class AcidRainApplet extends Applet implements KeyListener, ActionListener
public AcidRainApplet ()
 super ();
int width = 600, height = 450;
int x = width / 2, y = height - 100, w = 27, h = 40;
int count = 0;
boolean playing = true, pause = true;
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int numRain = 80;
int maxRain = 200;
int speed = 5;
ImageIcon imgi = new ImageIcon ("homer.gif");
Image ch = imgi.getImage ();
javax.swing.Timer t;
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 this.addKeyListener (this);
 for (int i = 0 ; i < maxRain ; i++)
 rain = new Rain ();
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public void paint (Graphics g)
super.paint (g);
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if (playing)
g.drawImage (ch, x, y, null);
g.setColor (Color.green);
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if (rain [i].y > height)
rain [i].x = (int) (Math.random () * width);
rain [i].y = 0;
rain [i].sp = (int) (Math.random () * 5) + 2;
points++;
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playing = false;
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g.setColor (Color.red);
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public void resetVars ()
x = width / 2;
y = height - 100;
count = 0;
playing = true;
pause = true;
points = 0;
maxRain = 200;
speed = 5;
for (int i = 0 ; i < maxRain ; i++)
rain [i] = new Rain ();
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Rain ()
int x = (int) (Math.random () * width);
int y = 0;
int sp = (int) (Math.random () * 5) + 2;
Rain rain [] = new Rain [maxRain];
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repaint ();
public void keyTyped (KeyEvent k)
public void keyPressed (KeyEvent k)
int key = k.getKeyCode ();
if (!(pause))
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if (key == k.VK_RIGHT && x + w < width)
x += 5;
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numRain -= 10;
repaint ();
if (key == k.VK_UP && numRain != maxRain)
numRain += 10;
repaint ();
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if (pause)
pause = false;
t.start ();
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resetVars ();
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Irrespective of the working of your program, I would suggest you remove a lot of weeds and clean the code. That would help you do easier debugging .
Somethings I can quickly tell are,
the constructor in AcidRainApplet not useful, Rain implementing Applet not useful, implements KeyListener, ActionListener can be delegated to another class, usage of inner class can be rethinked of delegation can be given a thought. Following code can be thought of :
class Rain
 private int x = 0;
 private int y = 0;
 private int sp = 0;
 Rain ()
 reset();
 public int getX() {
 return x;
 public int getY() {
 return y;
 public void setX(int x) {
 this.x = x;
 public void setY(int y) {
 this.y = y;
 public void reset() {
 x = (int) (Math.random () * width);
 y = 0;
 sp = (int) (Math.random () * 5) + 2;
}Good wishes,
Rajesh

"Class can't be instantiated " error message. Help !

Dear Java People,
In trying to do a program that outputs a sound with every button click
I have no compilation errors but a runtime error that says:
"class can't be instantiated"
below is the program and below that the error message
thank you in advance
Norman
import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import java.applet.*;
import java.awt.event.*;
import java.net.*;
public abstract class MyMusicApplet_1 extends JApplet implements ActionListener, AppletContext
 //AppletContext myAppletContext = new AppletContext();
 //Iterator i = myAppletContext.getStreamKeys();
 JButton myJButton;
 AudioClip acSound_1;
 AudioClip acSound_2;
 AudioClip acSound_3;
 AudioClip acSound_4;
 AudioClip acSound_5;
 AudioClip acSound_6;
 AudioClip acSound_7;
 AudioClip acSound_8;
 AudioClip acSound_9;
 JButton myJButtonSound1;
 JButton myJButtonSound2;
 JButton myJButtonSound3;
 JButton myJButtonSound4;
 JButton myJButtonSound5;
 JButton myJButtonSound6;
 JButton myJButtonSound7;
 JButton myJButtonSound8;
 JButton myJButtonSound9;
public void init()
 try
 acSound_1 = getAudioClip(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk"));
 acSound_2 = getAudioClip(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk"));
 acSound_3 = getAudioClip(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk"));
 acSound_4 = getAudioClip(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk"));
 acSound_5 = getAudioClip(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk"));
 acSound_6 = getAudioClip(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk"));
 acSound_7 = getAudioClip(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk"));
 acSound_8 = getAudioClip(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk"));
 acSound_9 = getAudioClip(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore.wrk"));
 catch (MalformedURLException e)
 System.out.println("Error here " );
 Container myContentPane = getContentPane();
 myContentPane.setLayout(new FlowLayout(FlowLayout.RIGHT));
 Dimension buttonSize = new Dimension(190,100);
 Font myFont = new Font("Arial", Font.BOLD,14);
 Border myEdge = BorderFactory.createRaisedBevelBorder();
 //create 1st button's object
 myJButtonSound1 = new JButton("sound #1");
 myJButtonSound1.addActionListener(this);
 //set the button's border and size, font background and foreground
 myJButtonSound1.setBorder(myEdge);
 myJButtonSound1.setPreferredSize(buttonSize);
 myJButtonSound1.setFont(myFont);
 myJButtonSound1.setBackground(Color.orange);
 myJButtonSound1.setForeground(Color.black);
 //create 2nd button's object
 myJButtonSound2 = new JButton("sound #2");
 myJButtonSound2.addActionListener(this);
 //set the button's border and size, font, background and foreground
 myJButtonSound2.setBorder(myEdge);
 myJButtonSound2.setPreferredSize(buttonSize);
 myJButtonSound2.setFont(myFont);
 myJButtonSound2.setBackground(Color.blue);
 myJButtonSound2.setForeground(Color.black);
 //create 3rd button's object
 myJButtonSound3 = new JButton("sound #3");
 myJButtonSound1.addActionListener(this);
 //set the button's border and size, font, background and foreground
 myJButtonSound3.setBorder(myEdge);
 myJButtonSound3.setPreferredSize(buttonSize);
 myJButtonSound3.setFont(myFont);
 myJButtonSound3.setBackground(Color.cyan);
 myJButtonSound3.setForeground(Color.black);
 //create 4th button's object
 myJButtonSound4 = new JButton("sound #4");
 myJButtonSound4.addActionListener(this);
 //set the button's border and size, font background and foreground
 myJButtonSound4.setBorder(myEdge);
 myJButtonSound4.setPreferredSize(buttonSize);
 myJButtonSound4.setFont(myFont);
 myJButtonSound4.setBackground(Color.pink);
 myJButtonSound4.setForeground(Color.black);
 //create 5th button's object
 myJButtonSound5 = new JButton("sound #5");
 myJButtonSound5.addActionListener(this);
 //set the button's border and size, font background and foreground
 myJButtonSound5.setBorder(myEdge);
 myJButtonSound5.setPreferredSize(buttonSize);
 myJButtonSound5.setFont(myFont);
 myJButtonSound5.setBackground(Color.red);
 myJButtonSound5.setForeground(Color.black);
 //create 6th button's object
 myJButtonSound6 = new JButton("sound #6");
 myJButtonSound6.addActionListener(this);
 //set the button's border and size, font, background and foreground
 myJButtonSound6.setBorder(myEdge);
 myJButtonSound6.setPreferredSize(buttonSize);
 myJButtonSound6.setFont(myFont);
 myJButtonSound6.setBackground(Color.pink);
 myJButtonSound6.setForeground(Color.black);
 //create 7th button's object
 myJButtonSound7 = new JButton("Choice #7");
 myJButtonSound7.addActionListener(this);
 //set the button's border and size, font, background and foreground
 myJButtonSound7.setBorder(myEdge);
 myJButtonSound7.setPreferredSize(buttonSize);
 myJButtonSound7.setFont(myFont);
 myJButtonSound7.setBackground(Color.cyan);
 myJButtonSound7.setForeground(Color.black);
 //create 8th button's object
 myJButtonSound8 = new JButton("Choice #8");
 myJButtonSound8.addActionListener(this);
 //set the button's border and size, font background and foreground
 myJButtonSound8.setBorder(myEdge);
 myJButtonSound8.setPreferredSize(buttonSize);
 myJButtonSound8.setFont(myFont);
 myJButtonSound8.setBackground(Color.yellow);
 myJButtonSound8.setForeground(Color.black);
 //create 9th button's object
 myJButtonSound9 = new JButton("Choice #9");
 myJButtonSound9.addActionListener(this);
 //set the button's border and size, font background and foreground
 myJButtonSound9.setBorder(myEdge);
 myJButtonSound9.setPreferredSize(buttonSize);
 myJButtonSound9.setFont(myFont);
 myJButtonSound9.setBackground(Color.blue);
 myJButtonSound9.setForeground(Color.black);
 //add the buttons to the content pane
 myContentPane.add(myJButtonSound1);
 myContentPane.add(myJButtonSound2);
 myContentPane.add(myJButtonSound3);
 myContentPane.add(myJButtonSound4);
 myContentPane.add(myJButtonSound5);
 myContentPane.add(myJButtonSound6);
 myContentPane.add(myJButtonSound7);
 myContentPane.add(myJButtonSound8);
 myContentPane.add(myJButtonSound9);
 public void actionPerformed(ActionEvent e)
 myJButton = (JButton)e.getSource();
 if(myJButton == myJButtonSound1)
 acSound_1.play();
 if(myJButton == myJButtonSound2)
 acSound_2.play();
 if(myJButton == myJButtonSound3)
 acSound_3.play();
 if(myJButton == myJButtonSound4)
 acSound_4.play();
 if(myJButton == myJButtonSound5)
 acSound_5.play();
 if(myJButton == myJButtonSound6)
 acSound_6.play();
 if(myJButton == myJButtonSound7)
 acSound_7.play();
 if(myJButton == myJButtonSound8)
 acSound_8.play();
 if(myJButton == myJButtonSound9)
 acSound_9.play();
java.lang.InstantiationException
 at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance(InstantiationExceptionConstructorAccessorImpl.java:30)
 at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
load: stan_my_music_applet_1.MyMusicApplet_1.class can't be instantiated.
 at java.lang.Class.newInstance0(Class.java:306)
 at java.lang.Class.newInstance(Class.java:259)
 at sun.applet.AppletPanel.createApplet(AppletPanel.java:566)
 at sun.applet.AppletPanel.runLoader(AppletPanel.java:495)
 at sun.applet.AppletPanel.run(AppletPanel.java:292)
 at java.lang.Thread.run(Thread.java:536)

I also tried:
try
for(int a=0;a<8;a++)
{acSounds[a] = getAudioClip(getCodeBase(),(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore" + (i + 1) + ".wrk")));
and the error message still says:
"MyMusicApplet3.java": Error #: 300 : method getAudioClip(java.net.URL, java.net.URL) not found in class stan_my_music_applet_3.MyMusicApplet3 at line 19
Help !
below is the revised code
Norman
import java.util.*;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;
import java.applet.*;
import java.awt.event.*;
import java.net.*;
public class MyMusicApplet3 extends JApplet implements ActionListener
AudioClip[] acSounds= new AudioClip[9];
public void init()
 try
 for(int a=0;a<8;a++)
 {acSounds[a] = getAudioClip(getCodeBase(),(new URL ("c:/Program Files/Cakewalk/Cakewalk Pro Audio 9/seashore" + (a + 1) + ".wrk")));
catch (Exception e)
 System.out.println("Error here " );
 Container myContentPane = getContentPane();
 myContentPane.setLayout(new FlowLayout(FlowLayout.RIGHT));
 myContentPane.add(getButton("1", Color.orange));
 myContentPane.add(getButton("2", Color.blue));
 myContentPane.add(getButton("3", Color.cyan));
 myContentPane.add(getButton("4", Color.pink));
 myContentPane.add(getButton("5", Color.red));
 myContentPane.add(getButton("6", Color.pink));
 myContentPane.add(getButton("7", Color.cyan));
 myContentPane.add(getButton("8", Color.yellow));
 myContentPane.add(getButton("9", Color.blue));
 public void actionPerformed(ActionEvent e)
 String command = e.getActionCommand();
 int index = Integer.parseInt(command)-1;
 acSounds[index].play();
 public JButton getButton(String label, Color fore)
 { JButton button = new JButton("sound "+label);
 button.setPreferredSize(new Dimension(190,100));
 button.setFont(new Font("Arial", Font.BOLD,14));
 button.setBorder(BorderFactory.createRaisedBevelBorder());
 button.setForeground(fore);
 button.setBackground(Color.orange);
 button.addActionListener(this);
 button.setActionCommand(label);
 return button;
 }//"MyMusicApplet3.java": Error #: 300 :
//method getAudioClip(java.net.URL, java.net.URL) not found in class
// stan_my_music_applet_3.MyMusicApplet3 at line 19, column 24

Class can't be instantiated

Hi guys
Just having trouble running this applet for some reason, in any browser. Other applets are working at the minute, so it doesn't look like a prob with the browsers or JVM.
Heres the code, followed by the error message.
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public abstract class ColourButtons extends Applet
 implements ActionListener, MouseListener
 private Button colorButtons[] = new Button[7];
 private Color color = Color.black;
 int x1, y1, x2, y2 = 1;
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 setLayout(new BorderLayout(20,20));
 Panel pWest = new Panel();
 pWest.setLayout(new GridLayout(7,1));
 for(int x =0; x <= 6; x++)
 colorButtons[x] = new Button(" ");
 pWest.add(colorButtons[x]);
 add("West",pWest);
 //add actionlisteners for each button
 colorButtons[x].addActionListener(this);
 if(x == 0){
 color = Color.red;}
 else if( x==1){
 color = Color.blue;}
 else if(x==2){
 color = Color.green;}
 else if(x==3){
 color = Color.yellow;}
 else if(x==4){
 color = Color.orange;}
 else if(x==5){
 color = Color.black;}
 else if(x==6){
 color = Color.white;}
 colorButtons[x].setBackground(color);
 setBackground(Color.gray);
 public void paint(Graphics g)
 Graphics2D g2 = (Graphics2D)g;
 g2.setColor(color);
 //create Rectangle Object
 Rectangle myRectangle = new Rectangle(x1,y1,x2,y2);
 g2.draw(myRectangle);
 g2.drawString("HELLO", 150,100);
 public void actionPerformed(ActionEvent a)
 Button button = (Button)a.getSource();
 color = button.getBackground();
 repaint();
 public void mouseClicked(MouseEvent e)
 public void mouseEntered(MouseEvent e)
 public void mouseExited(MouseEvent e)
 public void mousePressed(MouseEvent e)
 x1 = e.getX();
 y1 = e.getY();
 public void mouseReleased(MouseEvent e)
 x2 = e.getX();
 y2 = e.getY();
}And heres the error message.
load: ColourButtons.class can't be instantiated.
java.lang.InstantiationException
at sun.reflect.InstantiationExceptionConstructorAccessorImpl.newInstance
(InstantiationExceptionConstructorAccessorImpl.java:30)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:306)
at java.lang.Class.newInstance(Class.java:259)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:566)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:495)
at sun.applet.AppletPanel.run(AppletPanel.java:292)
at java.lang.Thread.run(Thread.java:536)
Any ideas at what is wrong?
Any help/pointers greatly appreciated
Cheers

ok cheers thats sorted it. For some reason it wanted it to be abstract once i added mouse listener i think.
Anyway cheers

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Yesterday FlashBuilder was automatically updated for Adobe updater and now Flashbuilder shows an error: "Could not open the editor: The editor class could not be instantiated. This usually indicates a missing no-arg constructor or that the editor's class name was mistyped in plugin.xml."
Bellow some lines of log error:
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at com.adobe.flexbuilder.mxml.editor.MXMLEditor.<init>(MXMLEditor.java:120)
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at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java: 39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorIm pl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(Re gistryStrategyOSGI.java:170)
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at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(C onfigurationElementHandle.java:51)
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I can't work without him!!!

Just had this problem occur as well.
All the workspaces seem to now have the Flash Player Icons on the menu. They were not there before.
If I create a new workspace, it seems to work fine until I switch to any existing workspace and then the new workspace is also affected.
I can import a project from the other workspaces, into a new workspace and that works as well.
My only mental history is that all was well. Then I spent some time writing a project in CS4 for a day without any need for Flex Builder. Then when I returned to FLex Builder the last opened project would not run and although I can get to the new project screen, the next and Finish button although enabled fail silently.
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Abstract Class can't be instantiated

Hi I'm getting the following error messages while compiling. Does any one have any idea how to get RID of it?
ERROR MESSAGES:
EditableHeaderTableExample2.java:48: inner class EditableHeaderTableExample2. MyComboRenderer is an abstract class. It can't be instantiated.
MyComboRenderer renderer = new MyComboRenderer(items);
^
EditableHeaderTableExample2.java:79: Method redefined with different return type: javax.swing.table.TableCellRenderer getTableCellRendererComponent(javax.swing.JTable, java.lang.Object, boolean, boolean, int, int) was java.awt.Component getTableCellRendererComponent(javax.swing.JTable, java.lang.Object, boolean, boolean, int, int)
public TableCellRenderer getTableCellRendererComponent(
^
2 errors
Here is the code:
EditableHeaderTableExample2.java
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.*;
import javax.swing.JComponent;
import javax.swing.JComboBox;
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import javax.swing.border.*;
import javax.swing.JTable;
import javax.swing.plaf.metal.*;
import javax.swing.JFrame;
import javax.swing.table.TableColumn;
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import javax.swing.table.TableCellRenderer;
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class MyComboRenderer extends JComboBox implements TableCellRenderer
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addItem(items[i]);
public TableCellRenderer getTableCellRendererComponent(
JTable table, Object value,
boolean isSelected, boolean hasFocus,
int row, int column) {
setSelectedItem(value);
return this;

This is not a suggestion, it's a requirement. When you say
class MyComboRenderer extends JComboBox implements TableCellRendererthe "implements TableCellRenderer" part is a promise that your class will include a method whose signature is
 Component getTableCellRendererComponent(JTable table, Object value,
 boolean isSelected, boolean hasFocus,
 int row, int column);

Re: class can't be instantiated/ applet not initialized error

I would change the following:
From:
public abstract class AmazingApplet extends JApplet implements ActionListener
to:
public class AmazingApplet extends JApplet implements ActionListener
Also, since your class implements ActionListener, you must have an actionPerformed method (to take care of the addActionListener that you used all over the place.
V.V.

Thanks Viravan,
When I remove "abstract", I get the following error message:
AmazingApplet.java:7: AmazingApplet should be declared abstract; it does not define actionPerformed(java.awt.event.ActionEvent) in AmazingApplet
public class AmazingApplet extends JApplet implements ActionListener
Also, I do have actionPerfomed method in the program. Any suggestions?

Applet Class can't be Instantiated - InstantiationException

I'm developing a small chat Applet and trying to load it over IE5.0. It say's it cannot Instantiate the Applet and Netscape says that the Class cannot be loaded. This Chat Applet is not an Abstract class or an interface.

Hi,
Thanx for your reply. The Client does extends Applet and the code is straight and simple. Do you have any assumptions over what may be the cause?

Flash class can not be loaded

Hi there,
this is the 2nd time I get this error, now I want to know
what's wrong: I have written a class that imports flash.geom.Point.
I can use this class in other projects fine, but for some projects,
it throws the error when compiling:
The class or interface 'flash.geom.Point' could not be
loaded.
with a reference to the mentioned class file.
What's this? Why it's working in other projects, but not in
these? As far as I can tell, the projects are not very different
from each other, they are different states branching off the same
basis project, but they do import different classes besides the
class mentioned. Probably some issues with the other imported
classes? A working projects imports a second class which also uses
flash.geom.Point; the failing project imports another class that
does not import any other classes. Can't see something wrong
here...
So, does anyone have an advice on this?
greets,
blemmo

well well... if you use Flash 8 classes, make sure to publish
for Flash player 8... d'oh.
blemmo

SubParagraphGroupElement can not be instantiated

I was trying to instantiate the class SubParagraphGroupElement and got this error - "Main Thread (Suspended: Error: Attempted construct of invalid FlowElement subclass)"
Exemple:
var subP:SubParagraphGroupElement = new SubParagraphGroupElement();
This is a bug?, if not how should I proceed to instantiate this class. Thanks.

Hi, Abhishek, thanks for the reply.
I would like to create a group of elements within a paragraph, and thus can handle them, like this
Imaginary exemple:
<TextFlow fontFamily="Trebuchet MS" fontSize="20" lineBreak="toFit" whiteSpaceCollapse="preserve" xmlns="http://ns.adobe.com/textLayout/2008">
 
 <group id='my_group'>
 Lorem
 Ipsum 
 </group>
 other text
 
</TextFlow>
This is only a hypothetic exemple.
Thanks.

Can not view applet in browser (IE5.5)

only my appletviewer shows my very simple applet.
in the IE5.5 i can not view my applet... ?
my applet just have write a string...
any help ?

http://forum.java.sun.com/thread.jsp?forum=31&thread=276607

Content server can not load javax classes in classpath

I have added a jar including javax.* classes to classpath of content server.
I can see the jar in content sever configuration page of classpath.
But those javax.* class can not be loaded into content server.
Content server is throwing java.lang.ClassNotFoundException.
content server is running standalone.
Anyone knows why?
Thanks.
Edited by: lyx on Mar 20, 2012 2:29 PM

Anyone has similar issue?

Can not create an object for my c# form dll which has an ActiveX control

I want to create an object in teststand for my C# form dll which has an ActiveX Control . but the error says ActiveX control can not be instantiated because the current thread is not in a single-threaded apartment. can someone help to solve the problem?
Thanks.

Two options:
1) put the step in a subsequence and use the sequence call "New thread" option with the advanced setting "Use single-threaded Apartment". Put a wait step immediately after the sequence call to wait for the new thread.
2) Inside of your dll, using .NET APIs create a new thread initialized as STA and call your code from that. Have the original thread wait for the new thread to finish running your dialog code.
Hope this helps,
-Doug

Applet in ie 5.0: class can not be Instantiated

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