If you don't have scratch media or overwritable media in your library, the job queues. You need to make sure you have scratch media available before the job begins in order to prevent this.
You need to have sufficient overwritable in your library before the job starts. Otherwise it has nothing to write to. It is a matter of adjusting your overwrite protection period. To understand OPP better, see this document
thanks for the prompt reply , all the tapes are 2.3 TB so i am sure i have sufficient space , and the storage was set up as the below , am i doing anything wrong
Hope you are not moving (assigning) the tape to a particular media set before the job starts.
Secondly, are the OPP / APP settings of the media set "Keep Data for 4 weeks" changed from default to custom values ?