I contact support and they give me the solution.

"This is easy to fix.

Please review the example under the job’s Backup Repository Path setting.

Let’s say your datastore is named “datastore1”. Please try the following syntax:

/vmfs/volumes/datastore1

If you want to backup to a folder called “vm-backups” on datastore1 use this format:

/vmfs/volumes/datastore1/vm-backups


This should resolve the issue for you."

Thanks to Jeremy B.