Cinema4D OpenCL runtime library error

[albert.adler]

"No OpenCL runtime library could be found. Please install the appropriate OpenCL runtime for your machine. For more information please consult the ProRender documentation in the Cinema 4D help."

Cinema4d R20 team render client

Any ideas how to fix this error? I just want to use arnold render. I use machines with cpu and ram only.

[Stephen.Blair]

That's not an Arnold error