JAVA applet windows

[Chiheb Djabri]

Allo
I Have KDE 3.1 in linux Mandrake 9.2 and I have trouble using Java Applet with 
konqueror Web Browser...I Tried with Sun Java, IBM and even Blackdown but the 
problem is still the same: Java applet failed to show up I enabled Java 
console and it show the following lines:

Java VM version: 1.4.2-rc1
Java VM vendor:  Blackdown Java-Linux Team
COM.volano.VolanoChat 2.5.0.5 (www.volano.com)
Copyright © 1996-2002 Volano LLC. All rights reserved.
See http://chat.priape.com/volano/webapps/root/vcclient/document.html
See http://chat.priape.com/volano/webapps/root/vcclient/document.html
KJAS: Exception java.lang.NullPointerException during applet initialization
java.lang.NullPointerException
	at java.applet.Applet.getAudioClip(Unknown Source)
	at COM.volano.ve.<init>(DashoA5383)
	at COM.volano.vd.a(DashoA5383)
	at COM.volano.vd.<init>(DashoA5383)
	at COM.volano.vb.init(DashoA5383)
	at COM.volano.VolanoChat.init(DashoA5383)
	at org.kde.kjas.server.KJASAppletStub$2.run(KJASAppletStub.java:199)
	at java.lang.Thread.run(Unknown Source)
java.lang.NullPointerException
	at org.kde.kjas.server.KJASAppletStub.setFailed(KJASAppletStub.java:126)
	at org.kde.kjas.server.KJASAppletStub.access$300(KJASAppletStub.java:16)
	at org.kde.kjas.server.KJASAppletStub$2.run(KJASAppletStub.java:208)
	at java.lang.Thread.run(Unknown Source)

What Should I do to solve the problem???

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