Extending the Dialog Class

Question

Hey, I'm trying to extend the Dialog class into something called a DialogErrorBox, which is just what it sounds like: a dialog box specifically for telling the user about errors it encounters. Here's the code:
import java.awt.*;
import java.awt.event.*;
class DialogErrorBox extends Dialog implements ActionListener {
     public DialogErrorBox (Frame parent) {
    ...//modified to give a vague error message
     }//end constructor
public DialogErrorBox (Frame parent, String title, String message) {
    ...//worked as a function in my program
     }//end constructor
public void actionPerformed (ActionEvent evt) {
          this.dispose();
}The compiling error I recieve at both constructors is:
...cannot resolve symbol
symbol  : constructor Dialog  ()
location: class java.awt.Dialog
        public DialogErrorBox2 (Frame parent, String title, String message) {I can't figure out why this error would happen. I've made a class extending Frame(Frame and Dialog both extend Window) that looks almost exactly the same and it has no errors.
Help would be much appreciated.