Output Grid Table feature under Prediction profiler grey-out/deactivated

[#1]

Hi,

I ran  a DOE that has 27 factors (continuous) and with a disallowed combination. The Output Grid Table feature is grey-out under the Prediction Profiler. I was thinking it could be too many factors. I reduced the total factors to 3 in the model and even tried to reduce the grid points to 2, the Output Grid Table remain grey-out. Can someone help to explain why this could happened and how I can force to activate it? I have 512GB of memory 

[#2]

Paste the picture of the grey-out feature mentioned above