Issue when exporting a video in After effects and premiere pro

Hey there! for the past couple of weeks I've been having this issue that I just can't find a way to fix. When I try to export a video directly from After Effects, it just comes out black and 1 second long. (1st picture). At first I thought I wasn't selecting the whole lenght of the video, but I've checked multiple times and it's selected. When I try to send it to the Media encoder, it just turns out with this gradient (2nd picture). This happens to me both in After effects and premiere pro. 

The third picture is how the video turrns out when I export it directly from Premiere Pro. If I try doing it with the Media Encoder it turns out with the same puple gradient.

At first I thought maybe I was running out of memory space, then I formated my computer but it didn't help 😞