Hi, I'm getting this error when I run my Exchange group

APPLICATIONS:\Microsoft Exchange 2010: Backup of [APPLICATIONS:\Microsoft Exchange 2010] failed

formation parameter: CIRCULAR_PROMOTION_POLICY, may not be supported

102357:nsrsnap_vss_save:Unknown Application Information parameter: NSR_EXCH_INCL_SA, may not be supported

102357:nsrsnap_vss_save:Unknown Application Information parameter: NSR_SAVE_FROM_SAVEGRP_NSRSNAP, may not be supported

102345:nsrsnap_vss_save:Data mover host name not specified. Assuming local host: jdgexchmb2.jdg.co.za

102338:nsrsnap_vss_save:Backup is level FULL. Set GLR compatibility to YES.

80271:nsrsnap_vss_save:NMM .. Valid snapshot policy. Group: "General_Production_Exchange2010_RND" Snapshot Policy: "RolloverOnly" Snapshots Per Day: "1"  Retain: "0" Backup Snapshots: "All" Level: "full".

85460:nsrsnap_vss_save:NMM .. Valid snapshot policy for Federated backup. Group: "General_Production_Exchange2010_RND" Snapshot Policy: "RolloverOnly" Snapshots Per Day: "1"  Retain: "0" Backup Snapshots: "All" Level: "full".

nsrsnap_vss_save: Exchange federated ..This is a federated backup for Exchange DAG.

NMM .. Exchange2010 Shell interface is unavailable. This may indicate that the EMC powershell library was not properly registered.

96585:nsrsnap_vss_save:NMM .. Initialization success -- Exchange shell successfully initialized. Required for Exchange 2010 or Exchange 2013.

NMM .. Exchange Shell Exception  in function GetServersDAGFQDN

Internal error.

102333 1421040777 3 0 0 58704 60584 0 jdgexchmb2.jdg.co.za nsrsnap_vss_save NSR error 21 Exiting with failure. 0

please help