Workflow generation just hangs in 615


I have a workflow created in 6.1 and it is working fine.Now I have upgraded my workflow to 6.1.5, I am able to import the process created in 6.1 but when I try to generate the workflow generation just hangs. I have created new workflow in 6.1.5 and generated the same it works fine.

During compilation the code for Implementation module, controller, work flows, are generated and code generation for Task is hanging. I tried both manual and auto generation.

Can you please help solving this problem

Thanks & Regards
Selvaraj D