DataPortal.Update Failed on Server

I have one Project that holds the Web & Desktop application  (using VB )

In desktop app i am using a DataPortal.Update Method to update my Form Data, it works fine on my Local Machine................... but when i Deployed the project it is giving error on that Method.

Any help would really be appreaciated, unable to debug on Server.

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EXCEPTION DETAILS
Message:
There was a problem updating the Contractor.
Source:
CSLA
Target Site:
System.Object Update(System.Object)
Exception:
DataPortal.Update failed
Inner Exception:
DataPortal_Update method call failed
Stack Trace:
at InnovationProperty.BusinessObjects.TypeOfLossList.DataPortal_Update()
at CSLA.Server.DataPortal.CallMethod(Object obj, String method, Object[] params)
at CSLA.Server.DataPortal.Update(Object obj, DataPortalContext context)
at CSLA.DataPortal.Update(Object obj)
at CSLA.BusinessCollectionBase.Save()
at InnovationProperty.frmContractorProfile.UpdateContractor()

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