Ray-tracing on GPU disabled on MacBook Pro with double graphic card

Hi to all,

i've just installed the demo version of after effects on my new macbook pro 15".
It has these 2 graphic cards:

• Intel Iris Pro Graphics
• NVIDIA GeForce GT 750M
  2GB memory GDDR5

But when i open After effects CC i get this error:

Ray-tracing on GPU requires a dgraphic card NVIDIA approved and CUDA 5.0 or above. At the moment ray-tracing will use just the CPU.
I've seen on NVIDIA that mine is a CUDA GPU: https://developer.nvidia.com/cuda-gpus.
Why am i getting this error?

Thanks