Symptom
After migrating a shared disk library to another MediaAgent within the CommCell, initiating a backup job may display the following error:
No (subclient) data paths were found for the copy. Probably a library has been deconfigured.
Cause
Only one disk library was configured as the data path on the storage policy copy, and that disk library was deconfigured prior to assigning a new disk library as the data path.
Resolution
Change the data path of the associated storage policy copy by following the steps described in Change Default Data Path.