Error when backup LN to tape use command TAR

Hi,

I have daily backup from disk to tape using aix TAR for LN.
Once a while I receive error message like erpln/bse/tmp/bshell.1597646 or erpln/bse/tmp/tmp093994055 skipped : A file or directory in the path name does not exist.

Does anyone know this issue and how to eliminate ?

Thanks from Cindy