An error occurred while saving items

hi all,
We are using RTC 2.0.0.1,An error occurred while saving items
The error is:

Error Setting DRM Process Signature
(CRJAZ0322I 1 row was expected but 0 rows were found for handle "com.ibm.*@14481448(stateId:
[UUID _hBN-ceKYEd6QX6LEQJleu false)",)
at com.ibm.team.repository.service.internal.dataaccess.AbstractRow.oneOrStaleData(AbstractRow.java:322)
at com.ibm.team.repository.service.internal.dataaccess.UpdateItemCurrentRow.validateResult(UpdateItemCurrentRow.java:73)
at com.ibm.team.repository.service.internal.dataaccess.BatchingRowReceiver.simulatedBatch(BatchingRowReceiver.java:389)
at com.ibm.team.repository.service.internal.dataaccess.BatchingRowReceiver.executeBatch(BatchingRowReceiver.java:269)
at com.ibm.team.repository.service.internal.dataaccess.BatchingRowReceiver.execute(BatchingRowReceiver.java:196)

Thanks