VMware Backups Failing

I'm having an issue with my backup. Yesterday I started seeing this error when trying to backup my citrix server. I'm going to try and reboot the server but I was hoping someone could offer some other ideas. The other VM's on the host are backing up fine.

Note: Resource: "VMVCB::\\192.168.29.15\VCGuestVm\(DC)ha-datacenter(DC)\vm\CITRIX01" is not snappable. Attempting to back up directly from the source volume.
V-79-57344-34009 - An error was encountered creating on-disk catalog. If this is an incremental backup, cataloging of the generated media may not work correctly.

I'm using Backup Exec 2010 R3