License for VmWare Agent present but backup fails

I have a Windows Server 2012 R2 running Backup Exec 2014 with a license for a VmWare Agent.

The server is a media server that takes a backup of three virtual machines on a single host. The disk backup is then dupicated to tape.

The backup from the host to the media server is now failing, but worked succsesfully previously.

The exact error I am getting is:-

"VM- ESXi Backup To Disk then Duplicate to TapeDisk-Incremental 

Final error: 0xe00094a1 - The trial period for Backup Exec or for an agent or option has expired. You must enter the serial number to continue."

The license status reflects this:-

However when I look at the install options and licenses on this backup server, I see the VMWare agent license installed:-

Thanks in advance for your attention.