Pre-check for BE2010 to 2012 upgrade

I'm in the process to upgrade my BackupExec 2010 R3 to 2012, and when I'm running the pre-check process, I've got the following warning :

Tape device information - Warning - One or more devices on this computer are either not connected or not working.

But, if I goes into BE, all the devices are online and I don't see any missing drivers on the hardware device manager. No hidden devices too..

In the results of the pre-check, it didn't told what device is in problem...

My library is on the HCL, so any idea? I can't take the chance to have a not working device after the upgrade...

Thanks.