DPM writer was unable to snapshot the replica of %DatasourceName;. This may be due to: 1) No valid recovery points present ...

DPM writer was unable to snapshot the replica of %DatasourceName;. This may be due to:
1) No valid recovery points present on the replica.
2) Failure of the last express full backup job for the datasource.
3) Failure while deleting the invalid incremental recovery points on the replica.