Migrating cognos from 10.2 to 10.2.2: DPR-ERR-2002

[graijada]

Hi guys... I am facing the below issue after upgrading the cognos from 10.2 to 10.2.2:
"DPR-ERR-2002 Unable to execute the request because there were no connections to the process available within the configured time limit."

Below are the steps I followed:
1. Fresh installation of 10.2.2 on new server
2. Migrate the content store from 10.2 (windows box) to new environment (AIX box)
  after migrating, on UI level it shows all the reports/packages/connections but while opening any report, or accessing any package it gives above said error.

Can anyone talk about the compatibility of 10.2 to 10.2.2?
Can same content store be used in 10.2.2(AIX) or any upgrade is required?

Thanks!!