Physical Volume Library Drive not available - Not enough statistical Information

I formatted a new disk and added that disk to the backup exec 2012 storage

Now the backup disk gives me every time the message :

Not enough statistical information is available

State of disk = Online

When a job is running and wants to backup to that disk:

Error:

Final error: 0xe000810c - Physical Volume Library Drive not available.
Final error category: Backup Device Errors

What can I do? I reformatted the disk, re-added the disk....