Java error when starting Alice in Ubuntu 8.04

when i try to start alice (./run-alice)

I get the error

attempting to register mp3 capability... 
Registered succesfully
java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.81)
   at edu.cmu.cs.stage3.alice.authoringtool.JAlice.configInit(JAlice.java:258)
   at edu.cmu.cs.stage3.alice.authoringtool.JAlice.main(JAlice.java:117)
Caused by: java.lang.UnsatisfiedLinkError: libgtkpeer: libgtkpeer.so: cannot open shared object file: No such file or directory
   at java.lang.Runtime._load(libgcj.so.81)
   at java.lang.Runtime.loadLibrary(libgcj.so.81)
   at java.lang.System.loadLibrary(libgcj.so.81)
   at gnu.java.awt.peer.gtk.GtkToolkit.<clinit>(libgcj.so.81)
   at java.lang.Class.initializeClass(libgcj.so.81)
   at java.lang.Class.forName(libgcj.so.81)
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.81)
   ...2 more

Any idea whats wrong?

Figured it out my self

had to update java to java6 and than update the alternatives and than change some ofhte Java Permissions.