First, screen shots are not helpful. In the future, provide a URL to the project repository. See:
https://discourse.gohugo.io/t/requesting-help/9132
Second, I still have no idea why you are referring to Go modules, unless it is in your project (not the theme)—and you have not provided access to your project. https://github.com/Jades1/netlify is not a project; I’m not sure what it is.
Third, this works fine:
hugo new site foo
cd foo
git init
git clone --recurse-submodules https://github.com/StaticMania/hugo-cohub themes/cohub
echo "theme = 'cohub'" >> config.toml
cd themes/cohub/exampleSite/
hugo server --theme ../..