I’ve not seen these specific messages before but a few things to check would be:
Is the library in random or sequential mode (set via the operator panel on the library) I think it should be in random mode.
Check that the tape library is varied on and that the tape drive (TAP05) is varied off.
Check “WRKMLBSTS” and check that the tape drive (TAP05) is allocated to the library and operational.
Hope this helps.