Exchange backup fails with error : 136553:nsrnmmsv: NMM .. Exchange2010 Shell interface is unavailable.

Backups of Microsoft Exchange is failing
Getting below error while taking Microsoft Exchange backup using NMM.

C:\Windows\system32>nsrnmmsv -P
107092:nsrnmmsv: Version information for C:\Program Files\EMC NetWorker\nsr\bin\
nsrnmmsv.exe:   Original file name: nsrnmmsv.exe        Version: 9.0.1.669
Comments: Supporting Microsoft Volume Shadow Copy Service

Changing backup name POLYEXCHANGE01 to primary name polyexchange01.globalpolycab
.com for multi-NIC configured client.
136553:nsrnmmsv: NMM .. Exchange2010 Shell interface is unavailable. This may indicate that the EMC powershell library was not properly registered.

111867:nsrnmmsv:Exchange2010 Shell interface is not initialised.
145370:nsrnmmsv: Initialization error -- Exchange shell failed to initialize. Required for Exchange.

117296:nsrnmmsv: Failed to list supported save sets.

102332:nsrnmmsv: Exiting with success.

Re-register NMM Microsoft Exchange PowerShell interface library
Run command: 
C:\Windows\Microsoft.NET\Framework64\yyy\RegAsm.exe "xxx\nsr\bin\libnmmpsmgmtexchange.dll"
**Replace xxx with NetWorker installation path (e.g. C:\Program Files)
yyy is the version of the Framework installed on the client.

For Ex:
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\RegAsm.exe "C:\Program Files\EMC NetWorker\nsr\bin\libnmmpsmgmtexchange.dll"

Make sure that To create an NMM Exchange administrator account from NMM Exchange Admin configuration tool.
Refer guide "EMC NetWorker Module for Microsoft for Exchange Server VSS 9" page # 22 for more details. Run the command :
nsrnmmsv -P 
check it should list the exchange save sets.