Execption while Creating MM

Hi Experts

I am facing the Unexpected exception while creating Message Mapping in PI7.1 .And the same error message i got when i am trying to open already created message Mapping.Please help me to resolve this error.

Error Message :

com.sap.aii.ib.bom.gen.container.ContainerHelper; local

class incompatible: stream classdesc serialVersionUID

= 3911155493117763752, local class serialVersionUID

= 42

Thanks &Regards

Upendra.V

Edited by: upendra v on Apr 26, 2009 12:48 PM