resolve cannot find cuda driver

Please help...
I am on a mac os 10.10.5 Yosemite and I had a problem with my computer so I erased hard drive and re-installed OS and Davinci Resolve.
When I run Resolve now I get a message that says "Davinci Resolve has not found the CUDA driver"...
What happen to it??? sorry, I am a newbie.. I am running Resolve 12.5.6
was working fine before.
I am on a mac os 10.10.5 Yosemite and I had a problem with my computer so I erased hard drive and re-installed OS and Davinci Resolve.
When I run Resolve now I get a message that says "Davinci Resolve has not found the CUDA driver"...
What happen to it??? sorry, I am a newbie.. I am running Resolve 12.5.6
was working fine before.