Problem: cannot overwrite active tape

[Sebastian K�sters]

Hi!

I got a Problem with Amanda. 

I did a backup with �amdump <<name>>�. 

Doing the backup works fine but making a �amcheck <<name>>� �after the
backup (before the backup is everything ok) says the following error :
�cannot overwrite active tape DailySet100�. �
After making the backup it is not possible to do the backup once again.

What must I do to make it work correctly?

Thanks for the Help!

Regards, Sebastian