siebel upgrade fails with Error "Error executing Action(Export prior customer Repository)

Hello Everyone,

I am trying to upgrade from siebel 8.1.1.5 to 8.1.1.11.when i ran the upgrep i am struck with the following error

Action begin (Export Prior Customer repository)

UpgradeLog UpgradeInfo 3 00000002543f16cc:0 2014-10-16 18:59:07 Item=24

UpgradeLog UpgradeInfo 3 00000002543f16cc:0 2014-10-16 18:59:07 Status Message (Executing...)

UpgradeLog UpgradeInfo 3 00000002543f16cc:0 2014-10-16 18:59:07 Executing (E:\sba81\siebsrvr\bin\repimexp.exe /a E /G ENU /u SADMIN /p ******** /c "SBA_81_DSN" /D siebel /M y /R "Prior Customer Repository" /F E:\sba81\dbsrvr\oracle\prior_custrep.dat /l E:\sba81\siebsrvr\log\upgrep_dev_811sia\output\repd3.log)

UpgradeLog UpgradeError 1 00000002543f16cc:0 2014-10-16 18:59:08 (err=1) was returned by application (E:\sba81\siebsrvr\bin\repimexp.exe /a E /G ENU /u SADMIN /p ******** /c "SBA_81_DSN" /D siebel /M y /R "Prior Customer Repository" /F E:\sba81\dbsrvr/oracle/prior_custrep.dat /l E:\sba81\siebsrvr\log\upgrep_dev_811sia\output/repd3.log).