Bplabel failed with the error message "error requesting media (tpreq) (98) " for a particular tape.

You need to check you media rules - the tape is showing as expired - this does not relate to data it relates to the tape itself - reteired as in too old and dont use it again

Usually this would be set under your barcide rules on the inventory section (inventory robot - advanced options - barcode rules) and is set as a maximum number of mounts (max mounts / cleanings)

That section should be set to zero.

You can also view this column (Columns - Layout .. show max mounts and also media expiry) in the media view of the admin console

You can change the max mounts and media expiry date for media by right clicking it and select "change"

Check your tapes and set them all to "no limit" for max mounts and "never" for expiration date to prevent this happening again

The reason it worked after you deleted it and re-added it was NetBackup saw it as new media so will start the clock again - but eventually it will physically expire again if you have these rules setup

Hope this helps