Error when creating Model in DC

Hi

Am trying to create new model to call RFC in to DC. I gave all Logical names and SAP login details. It giving a below error after click on NEXT on sap logon Information window.

Internal error:

An internal error has occured. See error log for more details.

Plug name: Web Dynpro Model Editor Services

Plugin ID: com.sap.ide.webdynpro.service.modeleditor

Class: com.sap.ide.webdynpro.modeleditor.wizard.model.creation.modelDialog

Method: nextPressed

Message: Internal error - see details information in exception trace

Exception: org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointExceoption)

Please advive if any any have ant same issue solved or any help.

thx

rag