Not able to replay in vugen - getting cci error

Hi all,

I'm able to record the flow in vugen but couldn't able to replay in vugen getting following error -
"Error: Vuser compilation failed. Please set CCIDebug to Off in CCI section of mdrv.dat file.
Warning: Extension cciext.dll reports error -19797 on call to function ExtPerProcessInitialize
Error: Thread Context: Call to service of the driver failed, reason - thread context wasn't initialized on this thread."

I haven't done any code modification or correlation.

Protocol - Oracle - 2 Tier
Vugen tried - 11.52 Patch1
& also tried with 12.02, 12.50
Os - windows 7

Please help me to resolve this error.

Thanks,
Yathish