Has anyone seen this error before?

10/04/1997 21:49:50  (TSA400 4.14 259) This program cannot allocate a
directory handle.
10/04/1997 21:49:50  ANS4033E System ran out of memory. Process ended.

My Novell servers have all started to give me this error and some won't
start a backup and some stop
 after completing a volume and then won't continue. Nothinbg has been
changed that I am aware of.
All Novell servers are up to 4.11 and the latest patches