Issues Creating Page from Flask Template

I’m trying to create a page using Gitlab’s Frozen-Flask template. I forked off of the project and I am now attempting to follow the instructions on at this site: Create a Pages website from a new project template | GitLab

Unfortunately, at step 5, after running the pipeline and clicking on Settings > Pages I get a “500 Whoops, something went wrong on our end.” I’m not sure what I’m doing wrong here but I’m a complete novice.