I was playing with themes for one of my sites, but it seems to have become “stuck” on a specific theme; changing the theme on the admin side was not doing anything. I deleted the theme out of the themes folder, so now it’s showing an error message: [https://craftarchive.ca/s/craft-contacts/page/welcome].
How do I assign another theme? This does not seem to be a problem with my other sites for some reason.