this is what happens when I try to access the app page.
No, what happened when you tried again?
Nope, I have never seen that.
That’s a Ruby on Rails error coming from the server, so it seems unlikely to me that it could be your fault. Nevertheless, I’d try clearing the browser cache, disabling any extensions, ad blockers, etc., just in case there’s a weird cookie set or a connection blocked or something. Maybe try another computer/browser if you can.