backing up FreeBSD server problems quiesced snapshot

HI,

We are backing up different Linux VMs. Almost all linux backups are finishing successfully. Just two FreeeBSD appliances are reporting:

A quiesced snapshot could not be created for the virtual machine machinename

Completed status: Failed
Final error: 0xe00095a7 - The operation failed because the vCenter or ESX server reported that the virtual machine's configuration is invalid.
Final error category: Resource Errors

For additional information regarding this error refer to link V-79-57344-38311

Is there a possibility to tell backup exec not to try a quiesced snapshot? Any other ideas?

Thanks for any help.