This issue occurs when you are trying to start Ca ARCserve RHA Control service which was unsinstalled or marked for deletion pending a reboot or awaiting a upgrade of control service or could be due to a incomplete Control service upgradation.
NOTE : Always backup the 'ws_scenarios' folder from installation directory of your Ca ARCserve RHA Control service. (usually located in 'C:\Program Files (x86)\CA\ARCserve RHA\Manager'
Intially try rebooting the Control service server and apply the upgrade process which would resolve the issue.
As a matter of best practice ; always backup your ws_scenarios' folder lcoated in Control service installation fodler.