Rush only renders a 24 byte file

I am trying to combine 4k 60fps video from my gopro hero 8. I am not trying anything fancy, but do want to keep 4k 60fps quality. I combine the video clips and then set them to render and the result is only a 24 byte file. I am on windows, with an i7 6700k, 16gb of ram, and gtx 1080ti. Please help me.