VM backup failed with error code -20 (invalid command parameter)

HELLO :)

I am not able to backup RHEL VM. It throws invalid command parameter (20) error message.

My Environment is

NBU 8.0
Master Server : WINDOWSMASTER.NET
Media Server  : HPUXMEDIA.NET
Client  : RHELVM.NET (i.e. which needs to back up.)

JOB DETAILS:

Aug 1, 2017 4:03:13 AM - Info bpbrm (pid=15850) RHELVM.NET is the host to backup data from
Aug 1, 2017 4:03:13 AM - Info bpbrm (pid=15850) reading file list for client
Aug 1, 2017 4:03:13 AM - Info bpbrm (pid=15850) start bpfis on client
Aug 1, 2017 4:03:15 AM - Info bpbrm (pid=15850) Starting create snapshot processing
Aug 1, 2017 4:03:16 AM - Info bpfis (pid=15858) Backup started
Aug 1, 2017 4:03:22 AM - Warning bpbrm (pid=15850) from client RHELVM.NET: WRN - Cannot stat /3PAR. Errno = 5: I/O error
Aug 1, 2017 4:03:23 AM - Warning bpbrm (pid=15850) from client RHELVM.NET: WRN - Cannot stat /3PAR. Errno = 5: I/O error
Aug 1, 2017 4:03:24 AM - Warning bpbrm (pid=15850) from RHELVM.NET: WRN - Cannot stat /3PAR. Errno = 5: I/O error
Aug 1, 2017 4:03:24 AM - Critical bpbrm (pid=15850) from client RHELVM.NET: FTL - process_fs_list() failed, status 20
Aug 1, 2017 4:03:24 AM - Info bpfis (pid=15858) done. status: 20
Aug 1, 2017 4:03:24 AM - end VMware: Create Snapshot; elapsed time 8759:59:25
Aug 1, 2017 4:03:24 AM - Info bpfis (pid=15858) done. status: 20: invalid command parameter
Aug 1, 2017 4:03:42 AM - Info bpbrm (pid=15863) Starting delete snapshot processing
Aug 1, 2017 4:03:44 AM - Info bpfis (pid=15875) Backup started
Aug 1, 2017 4:03:44 AM - Warning bpbrm (pid=15863) from client RHELVM.NET: WRN - cannot open /usr/openv/netbackup/online_util/fi_cntl/bpfis.fim.RHELVM.NET_1501581830.1.0
Aug 1, 2017 4:03:44 AM - Info bpfis (pid=15875) done. status: 4207
Aug 1, 2017 4:03:44 AM - end VMware: Delete Snapshot; elapsed time 8759:59:16
Aug 1, 2017 4:03:44 AM - Info bpfis (pid=15875) done. status: 4207: Could not fetch snapshot metadata or state files
Aug 1, 2017 4:03:50 AM - Info nbjm (pid=11204) starting backup job (jobid=1029) for client RHELVM.NET, policy HPUX_CoE_GRT, schedule Full
Aug 1, 2017 4:03:50 AM - Info nbjm (pid=11204) requesting STANDARD_RESOURCE resources from RB for backup job (jobid=1029, request id:{1234567A-7F22-405B-879B-1234A94C29CE})
Aug 1, 2017 4:03:50 AM - requesting resource HPUX_CoE_GRT-stu
Aug 1, 2017 4:03:50 AM - requesting resource WINDOWSMASTER.NET.NBU_CLIENT.MAXJOBS.RHELVM.NET
Aug 1, 2017 4:03:50 AM - requesting resource WINDOWSMASTER.NET.NBU_POLICY.MAXJOBS.HPUX_TEST
Aug 1, 2017 4:03:50 AM - granted resource WINDOWSMASTER.NET.NBU_CLIENT.MAXJOBS.RHELVM.NET
Aug 1, 2017 4:03:50 AM - granted resource WINDOWSMASTER.NET.NBU_POLICY.MAXJOBS.HPUX_TEST
Aug 1, 2017 4:03:50 AM - granted resource MediaID=@aaabA;DiskVolume=ABC_HPUX_CoE_GRT;DiskPool=HPUX_CoE_GRT;Path=ABC_HPUX_CoE_GRT;StorageServer=10.X.X.X;MediaServer=HPUXMEDIA.NET
Aug 1, 2017 4:03:50 AM - granted resource HPUX_CoE_GRT-stu
Aug 1, 2017 4:03:54 AM - estimated 0 kbytes needed
Aug 1, 2017 4:03:54 AM - begin Parent Job
Aug 1, 2017 4:03:54 AM - begin VMware: Start Notify Script
Aug 1, 2017 4:03:59 AM - Info RUNCMD (pid=12920) started
Aug 1, 2017 4:03:59 AM - Info RUNCMD (pid=12920) exiting with status: 0
Operation Status: 0
Aug 1, 2017 4:03:59 AM - end VMware: Start Notify Script; elapsed time 0:00:05
Aug 1, 2017 4:03:59 AM - begin VMware: Step By Condition
Operation Status: 0
Aug 1, 2017 4:03:59 AM - end VMware: Step By Condition; elapsed time 0:00:00
Aug 1, 2017 4:03:59 AM - begin VMware: Read File List
Operation Status: 0
Aug 1, 2017 4:03:59 AM - end VMware: Read File List; elapsed time 0:00:00
Aug 1, 2017 4:03:59 AM - begin VMware: Create Snapshot
Aug 1, 2017 4:04:16 AM - started process bpbrm (pid=15850)
Aug 1, 2017 4:04:28 AM - end writing
Operation Status: 20
Aug 1, 2017 4:04:28 AM - end Parent Job; elapsed time 0:00:34
Aug 1, 2017 4:04:28 AM - begin VMware: Stop On Error
Operation Status: 0
Aug 1, 2017 4:04:28 AM - end VMware: Stop On Error; elapsed time 0:00:00
Aug 1, 2017 4:04:28 AM - begin VMware: Delete Snapshot
Aug 1, 2017 4:04:44 AM - started process bpbrm (pid=15863)
Aug 1, 2017 4:04:48 AM - end writing
Operation Status: 4207
Aug 1, 2017 4:04:48 AM - begin VMware: End Notify Script
Aug 1, 2017 4:04:53 AM - Info RUNCMD (pid=27340) started
Aug 1, 2017 4:04:53 AM - Info RUNCMD (pid=27340) exiting with status: 0
Operation Status: 0
Aug 1, 2017 4:04:53 AM - end VMware: End Notify Script; elapsed time 0:00:05
Operation Status: 20
invalid command parameter (20)