How to move data from LTO4 (from one Tape library) to LTO7 on another Tape library?

Hello,

I have old Tape library TS3200 with LTO4 tapes and new Tape library HPE with LTO7 tapes. I would like to copy data from LTO4 to LTO7 tapes.
I worked according documentation Media Refresh (commvault.com) .
I have Enabled Media Refresh on Storage policy copy, media for Refresh I have marked Full, and Pick for Refresh. I have run Media Refresh job and choose tab Start new media…
No, I have error “There are not enough drives in the drive pool. This could be due to drive limit set on master pool if this failure is for magnetic library.”
I don’t know where the problem is?

Is there anything else to do for Media refresh operation?

Best regards,
Elizabeta