Hello Pooja,
1) goto shadow instance
2) run t-code SM37
3) look for the last active (or cancelled) job RDDMASGL
4) check its details (button named "Job Details"
5) find the work process it is/was using on the corresponding server
6) goto ST11 (or to the work folder on the OS level) and find the corresponding dev_w* trace file
7) you should be able to find the root cause of the error and/or hanging situation. Then check for SAP notes for corrections - or update this thread 
Regards,
Tomas Black