Error opening the snapshot disks using given transport mode: Status 23

Dear all,

I facing below error frequently

could you pls suggest how to fix this error and what logs i need to captures to find out the root cause. Thanks

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8/25/2020 11:04:20 PM - Error bpbrm(pid=7932) from client cbmoai-flsv01p: ERR - Error opening the snapshot disks using given transport mode: Status 23
8/25/2020 11:04:21 PM - Info bptm(pid=5564) waited for full buffer 1 times, delayed 55 times
8/25/2020 11:04:21 PM - Info bpbkar32(pid=6116) bpbkar waited 0 times for empty buffer, delayed 0 times.
8/25/2020 11:04:22 PM - Info bptm(pid=5564) EXITING with status 90 <----------
8/25/2020 11:04:25 PM - Error bpbrm(pid=7932) could not send server status message
8/25/2020 11:04:36 PM - Critical bpbrm(pid=7932) unexpected termination of client cbmoai-flsv01p
8/25/2020 11:04:45 PM - Info bpbkar32(pid=0) done. status: 6: the backup failed to back up the requested files
8/25/2020 11:04:45 PM - end writing; write time: 0:00:28
the backup failed to back up the requested files(6)