Hi Ragu,
The same issue has been happened for me long time back. I have solved this issue by running the Repair Full request and then Init. delta without Data Transfer.
May be this may also work for you.
Steps:
1.Delete the request by marking it as RED
2.Run Info package Repair full Request.
Once this is success,
3.Change Info package and Run Init delta without data transfer
4. If it pop ups Init Delta already exists,then delete the previous init from the source.
after the init delta is ended fine, then change your Info package to Delta as it is before.
Hope it helps.
regards
Deva