gimped - 2006-07-28

i get the error after I run this command
# java -jar FullSyncInstaller.jar

The error is below, how do I get passed it? I have the latest jre installed.  I am on Ubuntu 6.06.

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Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
at java.awt.Font.tk(libgcj.so.7)
at java.awt.Font.getPeerFromToolkit(libgcj.so.7)
at java.awt.Font.<init>(libgcj.so.7)
at javax.swing.plaf.FontUIResource.<init>(libgcj.so.7)
at javax.swing.plaf.metal.DefaultMetalTheme.<clinit>(libgcj.so.7)
at java.lang.Class.initializeClass(libgcj.so.7)
at javax.swing.plaf.metal.MetalLookAndFeel.createDefaultTheme(libgcj.so.7)
at javax.swing.plaf.metal.MetalLookAndFeel.<init>(libgcj.so.7)
at javax.swing.UIManager.<clinit>(libgcj.so.7)
at java.lang.Class.initializeClass(libgcj.so.7)
at com.izforge.izpack.installer.GUIInstaller.loadLookAndFeel(Unknown Source)
at com.izforge.izpack.installer.GUIInstaller.<init>(Unknown Source)
at java.lang.Class.newInstance(libgcj.so.7)
at com.izforge.izpack.installer.Installer.main(Unknown Source)
Caused by: java.lang.ClassNotFoundException: gnu.java.awt.peer.gtk.GtkToolkit
at java.lang.Class.forName(libgcj.so.7)
at java.lang.Class.forName(libgcj.so.7)
at java.awt.Toolkit.getDefaultToolkit(libgcj.so.7)
...14 more