KLUFU001 #VSSFUCB ERROR: SESSION STILL ACTIVE

Explanation
 An attempt was made to free a user control block
while a session was still active.

System action
 TMS:Engine takes a diagnostic abend with completion code U0100. The abend is associated with a
single TMS:Engine user, whose terminal may hang. A VCANCEL command may be necessary to reinstate the
hung user.

User response
 Contact IBM® Software
Support.

Severity
  ABEND