Upgrade error from CLM 3.0.1.1 to CLM 4.0

Hi

I recently upgraded from CLM 3.0.1.1 ( DB2 9.7 and WAS 7.0.0.19 )  to CLM 4.0  ( DB2 9.7 and WAS 7.0.0.19 ). The upgrade seems to have gone on fine and was able to see projects in RRC, RTC and RQM.

When I opened any RRC project and in the Dashboard under the Review's I got the following error.  Any new reviews are not to be seen as well.

All the other data is fine and have no issues in RRC, RTC and RQM.

Request to let me know how this could be resolved. 
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ID CRRRW7217E  The server request to obtain the review listing information could not be completed. There might be a heavy load on the server, causing the request to time out.

_38.firstChild is null
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Regards
V.Niranjan