when i make a backup from a netware volume this message occures

Error bpbrm(pid=4568) from client servername: ERR - unable to scan next dataset:
(SMS: FFFDFFC4: (TSAFS.NLM 6.50.11 315) The program's attempt to scan failed,
probably because an invalid path was specified.)

The backup stops and i can see that not all data is backuped.

Has anybody an tip