Error when importing RFC Module

Hi All, I'm trying to import a RFC Model from R/3 but, when I put the information to connect do R/3 Server, an internal error occur and I can't go to next step.

The error is:

Internal Error

An Internal Error has occured. See error log for more details.

Plugin name: web Dynpro Model Editor Services
Plugin ID: com.sap.ide.webdynpro.service.modeleditor
Class: com.sap.ide.webdynpro.service.modeleditor.wizards.model.creation.ModelDialog
Method: nextPressed
Message: Internal error - see detail information in exception trace
Exception: org.eclipse.swt.SWTException: Failed to execute runnable 
( java.lang.NoClassDefFoundError: com/sap/tc/logginngLogController )

Thanks in advance