Backup initiated from command line fails with a following error:
Operation with the Container %CTID% is finished with errors: Can't initialize control. The host does not have the necessary PVA components installed...
Meanwhile, backing up containers from PVA Management Node interface is working fine.
PVA Agent installation is corrupted.
In this situation the only viable solution is to re-install PVA Agent completely.
You may find steps required for PVA Agent re-installation in a following article: