Carbide.ui error

[CoreXE]

Please help me. I can't start Carbide.ui, because there's an error.

!SESSION Thu Sep 27 17:31:26 CEST 2007 -----------------------------------------
!ENTRY org.eclipse.core.launcher 4 0 2007-09-27 17:31:26.578
!MESSAGE Exception launching the Eclipse Platform:
!STACK
java.lang.ClassNotFoundException: org.eclipse.core.runtime.adaptor.EclipseStarter
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at org.eclipse.core.launcher.Main.invokeFramework(Main.java:333)
at org.eclipse.core.launcher.Main.basicRun(Main.java:280)
at org.eclipse.core.launcher.Main.run(Main.java:977)
at org.eclipse.core.launcher.Main.main(Main.java:952)

[CoreXE]

No idea? Is it a Java error?
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I've download the setup again, and it works!