Projectile - "PATH is not a project"?

Question

For some reason, Projectile has stopped allowing me to add new projects.

When I add the project, it seems to work. But when I select the project with C-c p p I get the following error:

Not sure how to fix this.

Answer 1

Using the answer from here, they said.

I think your project is indeed considered a project by projectile only if you have a .git folder in it (did you forget to git init?). I'm not seeing one in your case. You can alternatively add a .projectile file instead. Everything in that folder containing the .projectile file and all subfolders will be considered part of the same project.

[edit] to add to this, it must be a git repository with a non-hidden file commited to it. For example a repo that only contained .file_to_satisfy_projectile in the git history would not be sufficient, but file_to_satisfy_projectile would be.