Error on installation of Service pack 1 on PoManager

Error on installation of Service pack 1 on PoManager

Hi
I have OpManager 5.5 build 5004 running on Red hat Linux. I have updated the service pack 1

according to your instructions. Aftrer successfull updation the OpManager fail to start with the following error.
PM error in initialising classes in Topoilogy module
PM aborting server startup

Pl help