Check in SM37, whether you have this job now and running on regular basis (but not from last week as it is recommended to schedule this on a daily basis)? I would suggest you to first fix this and thereafter cross-check for above issue again.
Take help of your basis team if required and also cross-check SAP support for relevant SAP note(s) if required after scheduling/executing this job.
If this answers your question follow How to close a discussion and why
Regards
Rahul