A previous backup started on 'datetime', is using the resources needed for new backup is still pending.
A new backup can not be done until previous backup completes.
Processing stops.
Wait until previous backup completes before starting another local backup. Alternatively, use different copyType value to perform a local backup. TSM local backup policy only allows one incremental and one full background copy to be pending at any time, before local backup resources are reused for a new backup version. A new local backup would result in a backup with background copy in pending state.