Hi, Could anyone help me in the below error. I am getting the below error when i try to execute my application in WAS 6.1, which was working fine in WAS 5.1 java.io.InvalidClassException: com.acnielsen.arch.config.service.Service; local class incompatible: stream classdesc serialVersionUID = 987267098049263698, local class serialVersionUID = 8439492350081587999 I had tried hardcoding both these values one by one, but it doesnt work ...