Problema con Java

[Dumbridge]

Ciao a tutti. Ha smesso di funzionarmi Java sia su Firefox sia su Internet Explorer. Ogni volta mi restituisce questo errore:

mposta livello di traccia su <n>
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caricamento: classe pclient.main.ChatClient.class non trovata.
java.lang.ClassNotFoundException: pclient.main.ChatClient.class
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.net.UnknownHostException: host7.parachat.com
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.<init>(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.http://www.protocol.http.HttpURLConn...Client(Unknown Source)
at sun.net.http://www.protocol.http.HttpURLConn...onnect(Unknown Source)
at sun.net.http://www.protocol.http.HttpURLConn...onnect(Unknown Source)
at sun.net.http://www.protocol.http.HttpURLConn...Stream(Unknown Source)
at java.net.HttpURLConnection.getResponseCode(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
at sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
... 7 more
Eccezione: java.lang.ClassNotFoundException: pclient.main.ChatClient.class



Cosa può essere?