V-79-10000-11233 - VSS Snapshot error

I'm using Backup Exec 2014 in a server Windows Server 2008R2 and the job finished with exception V-79-10000-11233 - VSS Snapshot error for an other specific server (Windows server 2012) that hosts some VMs and is file server too.

Anybody could help me to disable symantec VSS provider to force backup exec to use Microsoft VSS instead !? I found some guides on the internet but nothing applicable.

Thanks