Exception occurred - help me please

Hi,
I am compiling some applets from Eclipse, I arrived to my last applet and I tested it in another PC with a MSVM ver 1.1.4 after sign it with my security certificate. These applets work with Sun VM but when I open just my last applet with the version 1.1.4 de MS the follow message appears:
Exception occurred during event dispatching:
java.lang.NullPointerException
     at com/ms/awt/WToolkit.checkScrImage
     at com/ms/awt/WToolkit.checkImage
     at java/awt/Component.checkImage
     at java/awt/ImageMediaEntry.getStatus
     at java/awt/MediaTracker.statusAll
     at java/awt/MediaTracker.waitForAll
     at java/awt/MediaTracker.waitForAll
     at ImageEditor/bo.<init>
     at ImageEditor/cw.L
     at ImageEditor/cw.m
     at ImageEditor/bh.a
     at ImageEditor/bh.mouseReleased
     at java/awt/Component.processMouseEvent
     at java/awt/Component.processEvent
     at java/awt/Component.dispatchEventImpl
     at java/awt/Component.dispatchEvent
     at com/ms/awt/ZComponentPeer.processEvent
     at java/awt/Component.dispatchEventImpl
     at java/awt/Container.dispatchEventImpl
     at java/awt/Component.dispatchEvent
     at java/awt/EventDispatchThread.run
And the error comes when I try to pass to my 2nd window applet.
Anybody could give me an idea why it is happening please?
Thank you
Panchitopro

Dear, turingcomplete :
Thanks for your help, I was changed the thread in my code, my problem was moved.
thank you again
sincerely
yours Urey

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