org.eclipse.core.runtime.AssertionFailedException in Eclipse RCP

If you are working on development (or bug fixing) of a eclipse-plugin application and you get this error:

org.eclipse.core.runtime.AssertionFailedException: assertion failed:

or any eclipse specific error, in order to find out the real exception thrown by your code proceed in this way:

1. Right click on the error message;
   
2. Open log
   

Thanks to Roman ;)