OK in netscape, but not in IE

I created an applet that will run fine on netscape6.2. I try to run the same applet on internet explorer5.0 and I get the following message in my java console:
java.lang.NullPointerException
at DApplet.start(DApplet.java:81)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
I have the java 1.4 plugin installed on both netscape and internet explorer. Can anyone please help?

If is not a netscape vs IE problem, than why would it work fine in the netscape browser? Below is the start code that is given the exception...please see if you can help.
this is my start code:
/**Stop the applet*/
public void stop() {
System.gc();
System.out.println("DApplet: stoped");
Thanks!

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