what dose the labe fail?

I have installed a nbu master server and media server on the same aix ,and the dirve is a LTO5 tape dirver  linked directly with the master server.Using the vmoprcmd,i can see there is a tape in the dirver,but it  has not been  labled.

When using the commond   'bplabel -m A00001 -d hcart2 -p NetBackup -o -u 0',it turned out 'Error reported by media operation: requested media id is not assigned to this host in the EMM database'

Can you help me how to solve this.

Thanks !