I install Digichat v4 and install the lastest java
but when try to load the chatmaster or any page conant java , its give me this error

load: class com.diginet.digichat.client.chatmaster.DigiChatMasterApplet not found.
java.lang.ClassNotFoundException: com.diginet.digichat.client.chatmaster.DigiChatMasterApplet
at sun.applet.AppletClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.applet.AppletClassLoader.loadCode(Unknown Source)
at sun.applet.AppletPanel.createApplet(Unknown Source)
at sun.plugin.AppletViewer.createApplet(Unknown Source)
at sun.applet.AppletPanel.runLoader(Unknown Source)
at sun.applet.AppletPanel.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)



and when try to use this

root@host [~/DigiChat_4.0]# java -cp ChatMaster.zip com.diginet.digichat.client.chatmaster.ChatMaster

got this error

No X11 DISPLAY variable was set, but this program performed an operation which requires it.
at java.awt.GraphicsEnvironment.checkHeadless(Unknown Source)
at java.awt.Window.<init>(Unknown Source)
at java.awt.Frame.<init>(Unknown Source)
at java.awt.Frame.<init>(Unknown Source)
at com.diginet.digichat.awt.v.<init>([DashoPro-V1.3BETA-091199])
at com.diginet.digichat.awt.v.<init>([DashoPro-V1.3BETA-091199])
at com.diginet.digichat.client.chatmaster.bv.<init>([DashoPro-V1.3BETA-091199])
at com.diginet.digichat.client.chatmaster.ChatMaster.<init>([DashoPro-V1.3BETA-091199])
at com.diginet.digichat.client.chatmaster.ChatMaster.main([DashoPro-V1.3BETA-091199])



is the problem in java install or digichat install or what !!! ?
thanks for advice