main method throws java.lang.NoClassDefFoundError

Hello,

I have the following issue, if I'd like to run my JUnit-Test.
This is the Exception:


Exception in thread "main" java.lang.NoClassDefFoundError: 
org/aspectj/lang/Signature
	at 
org.apache.cactus.internal.AbstractCactusTestCase.<clinit>(AbstractCactusTestCase.java:53)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:85)
	at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:58)
	at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:60)
	at java.lang.reflect.Method.invoke(Method.java:391)
	at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.getTest(RemoteTestRunner.java:370)
	at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:404)
	at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:311)
	at 
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)



As you can see lies the mistake in the main-method. I have absolutely no 
idea what to do or where the issue could be.

Could you please give some suggestion to resolve this issue. -Thanks

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