CANNOT_CREATE_COFILE during SPAM queue

This is usually solved by:
1. Check authorization for cofiles-folder (sidadm and servicesidadm)
2. Download the affected support package again. It can be corrupted
3. Any full tablespaces?

If you look into SLOG and find this error message:
WARNING: \\\sapmnt\trans\tmp\SAPKKB70014.ARP is already in use (10), I'm waiting 4 sec (20090515192357). My name: pid 7280 on (APServiceARP)

In my case the problem was corrupt support package. I downloaded the package, deleted the cofile and the datafile. Remember to also delete the pending transport request that you will find int the trans\tmp-folder.