I didn't know that you had a file library
I think that the 'omnimlist' is only going to work on physical media like tape. From the command synopsis:
The
omnimlist command lists the contents of a Data Protector medium. The command scans the
catalog (index) of the medium and shows all objects and sessions on the medium.
The command can also be used to display the Data Protector medium tape header. If used for such
purpose, the command reads the first block of the tape and then displays the information.
The 'Nothing Restored' and the failure of the 'omnidb =list_folders' command are probably going to require two cases be opened so that this can be properly investigated
Now, other people on the Forum may have some other thought, but, if not, open the cases