Unable to load render plug-in, render command not available

Hi, my rhino render is not working… it show the following when i try the command render ( Unable to load render plug-in, render command not available )
i dont know what is the problem, i tried many solutions i found here but didnt work…
any other solution please? anyone?
am using Win 8 Pro 64-bit and latest Rhino Version 5 SR10 64-bit
serial number : REMOVED BY ADMIN

Latest version is SR 12.

Please edit your post above and remove your your serial number - you are simply throwing your license number out there for everyone to see.

–Mitch