Hello LeonidS, Thank you for answering! I don't think it installed properly in the first place, but the keys are all definitely still there. I have deleted the app after disabling it first. Sorry, I didn't understand the second part. You mean a link to the site?

Thank you, yes after I installed Classes, I created a new class to test it. Everything worked fine until I hit the "Submit" button. Instead of redirecting me to a confirmation page, or to the new class, it went to a 404 page.