Eclipse, GWT plugin. Debugger does't work..

Ubuntu 10.10 SpringSource Tool Suite Version: 2.5.0.M3 Build Id:
201008251000 When I try to debug, Debug As-> web Application, the tab
with Source not found opens. With stack trace in debug mode:

Thread [main] (Suspended (exception ClassNotFoundException))
URLClassLoader$1.run() line: 202 [local variables unavailable]
AccessController.doPrivileged(PrivilegedExceptionAction<T>,
AccessControlContext) line: not available [native method]
Launcher$ExtClassLoader(URLClassLoader).findClass(String) line: 190
Launcher$ExtClassLoader.findClass(String) line: 229
Launcher$ExtClassLoader(ClassLoader).loadClass(String, boolean) line:
307
Launcher$AppClassLoader(ClassLoader).loadClass(String, boolean) line:
296
Launcher$AppClassLoader.loadClass(String, boolean) line: 301
Launcher$AppClassLoader(ClassLoader).loadClass(String) line: 248
InstrumentationImpl.loadClassAndStartAgent(String, String, String)
line: 280
InstrumentationImpl.loadClassAndCallPremain(String, String) line:
338

In the Development Mode tab is text with Development mode is loading,
where should be web app URL provided... So wtf?! Thank you!
By the way, same project checked out from SVN on Windows platform and
debbuger worked... Where might be the problem?

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