Examine the command output, debug logs, and system logs for a more detailed message on the error.

See "Setting Media Manager debug logging to a higher level" in the NetBackup Logging Reference Guide.

When you assign volumes manually, specify the volume pool that is associated with the volume. Always use barcodes that are unique in the six least significant characters, across all media in all of the robots, or use media ID generation rules to ensure that unique media IDs are generated in a robot inventory update.