Hi Virender,
This error can be experienced due to many reasons. based on my experience below reasons can cause this issue.
1) If you are using allocation check if allocation is correctly set.
2) In case you are using custom enhancements / user exits (in SD / GATP / CIF) check if any of them, causing this issue.
In my case correction of allocation setup could resolve this issue, so check what is the reason in your case.
Rgds
Sourabh