Error code 12 backup fails everytime

Hello Everyone.

Actually i can’t backup one of our computer each time it goes and the same error pops up don’t know what to do. i tried searching in the forum about it but doesn’t seem any one having same issue. Anyone have any idea what should i do to fix it …?

Here is the log and each time same error code 12

Info
07/04/18 09:41
Starting scheduled incremental file backup…
Info
07/04/18 09:44
Scanning for changed hard links on volume of “C:”…
Info
07/04/18 09:44
Indexing of “rvq6l5vi.default” done. 5 filesystem lookups 27 db lookups and 5 db updates
Info
07/04/18 09:44
Indexing of “Profiles” done. 7 filesystem lookups 152 db lookups and 5 db updates
Info
07/04/18 09:44
Indexing of “Desktop” done. 1 filesystem lookups 3664 db lookups and 1 db updates
Info
07/04/18 09:44
Following symbolic link at “C:\Users\user\Documents\My Music” to “C:\Users\user\Music” confirms symlink backup target “.symlink_Music” to “C:\Users\user\Music”
Info
07/04/18 09:44
Following symbolic link at “C:\Users\user\Documents\My Pictures” to “C:\Users\user\Pictures” confirms symlink backup target “.symlink_Pictures” to “C:\Users\user\Pictures”
Info
07/04/18 09:44
Following symbolic link at “C:\Users\User\Documents\My Videos” to “C:\Users\user\Videos” confirms symlink backup target “.symlink_Videos” to “C:\Users\user\Videos”
Info
07/04/18 09:44
Indexing of “Documents” done. 2 filesystem lookups 28 db lookups and 2 db updates
Info
07/04/18 09:44
PC221: Loading file list…
Info
07/04/18 09:44
PC221: Calculating file tree differences…
Info
07/04/18 09:44
PC221: Indexing file entries from last backup…
Info
07/04/18 09:44
PC221: Calculating tree difference size…
Info
07/04/18 09:44
PC221: Linking unchanged and loading new files…
Info
07/04/18 09:45
Waiting for file transfers…
Errors
07/04/18 09:54
Error getting complete file “hmTwUMsTx10Ev1mibucR|rvq6l5vi.default/Mail/pop3.email.com/Sent” from PC221. Errorcode: READ_ERROR (12)
Info
07/04/18 09:55
Waiting for file hashing and copying threads…
Warnings
07/04/18 09:56
Not all folder metadata could be applied. Metadata was inconsistent.
Info
07/04/18 09:56
Writing new file list…
Info
07/04/18 09:56
All metadata was present
Info
07/04/18 09:56
Number of copied file entries from last backup is 11559
Info
07/04/18 09:56
Transferred 4.67605 GB - Average speed: 61.7662 MBit/s
Info
07/04/18 09:56
Time taken for backing up client PC221: 14m 16s
Errors
07/04/18 09:56
Backup failed

many thanks