After a while I've changed the cleaning tape in an autoloader. Be 2014 (on windows 2008 r2) recorgnized the Cleaning tape in the slot.
The error is "clean drive 0002 -- the job failed with the following error: library error - attempt to clean a drive in a library with expired or bad cleaning media."
Also the error in the Job log is "V-79-57344-34028 - A backup storage read/write error has occurred. If the storage is tape based, this is usually caused by dirty read/write heads in the tape drive. Cl..."
How to say to BE2014 that the cleaning tape cassette is new?