Backup Exec fails to scan or inventory

Example of the error:

(Job: "Inventory Device 00059") Inventory Device 00059 -- The job failed with the following error: The parameter is incorrect

Also, while running Daily backups, I first get a message that the job failed because "The operation failed to acquire the minimum number of drives and media needed. " and later get a second message that it succeded. I am unable to verify the exact state of the drive because it is not updating when I scan it. Part of me suspects the connection to the Drive is broken, but I can connect to the web interface just fine. Does anyone have any ideas how to get scanning working again?