can't use freemind

Binary package hint: gij-4.1

I download and install freemind (deb version - freemind_0.8.0-1_all.deb) from
http://sourceforge.net/project/showfiles.php?group_id=7118&package_id=161831&release_id=355162

I can't start freemind.
The console message as follow.

freemind
Exception in thread "main" java.awt.AWTError: Cannot load AWT toolkit: gnu.java.awt.peer.gtk.GtkToolkit
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.70)
   at java.awt.GraphicsEnvironment.getLocalGraphicsEnvironment(libgcj.so.70)
   at java.awt.Window.<init>(libgcj.so.70)
   at java.awt.Frame.<init>(libgcj.so.70)
   at javax.swing.JFrame.<init>(libgcj.so.70)
   at freemind.main.FreeMind.<init>(FreeMind.java:107)
   at freemind.main.FreeMind.main(FreeMind.java:647)
Caused by: java.lang.UnsatisfiedLinkError: libgtkpeer: libgtkpeer.so: 無法開啟å
±ç”¨ç›®çš„檔: 沒有此一檔案或目錄
   at java.lang.Runtime._load(libgcj.so.70)
   at java.lang.Runtime.loadLibrary(libgcj.so.70)
   at java.lang.System.loadLibrary(libgcj.so.70)
   at gnu.java.awt.peer.gtk.GtkToolkit.<clinit>(libgcj.so.70)
   at java.lang.Class.initializeClass(libgcj.so.70)
   at java.lang.Class.forName(libgcj.so.70)
   at java.awt.Toolkit.getDefaultToolkit(libgcj.so.70)
   ...6 more

and the java version is:
~$ java -version
java version "1.4.2"
gij (GNU libgcj) version 4.1.2 (Ubuntu 4.1.2-0ubuntu5)

ProblemType: Bug
Architecture: i386
Date: Fri Mar 30 07:46:11 2007
DistroRelease: Ubuntu 7.04
Uname: Linux daggerlin-desktop 2.6.20-12-generic #2 SMP Wed Mar 21 20:55:46 UTC 2007 i686 GNU/Linux