I use RIFE-App 1.75 to process a 4k video file that has 137 MB file size. I get this error message in the console. Please advise us on how to resolve this issue. 

This is my setting.

The screen dump of Task Manager.

It's because you are using "Smooth Interpolation" option. It should only be used for small animations for now. But i'm working on improve it.

I got it. Thanks!!

But how can I reduce the frame rate from 192fps to 120fps 144fps?

For now you would need to use an external software, like ffmpeg. But i'm working in a new option so you can do that inside Rife-App