HELP! "Internal Error" message!

I am pretty sure I deleted something important. Maybe the entire code!
I got an error originally near the publish button saying that something was in the page data that was not somewhere else. (dont quite remember.) then i started poking around and found a file that had “json” next to it. Thats where the error told me the issue was coming from. So i deleted it. Then when i reloaded the page, EVERYTHING WAS GONE!
Im not sure how to get to a previously un altered state. PLEASE HELP!

What’s your app ID?

It is here.
E5157DC4-EC5A-8459-FF3D-A8D23175C900

UI Builder opens just fine now. If you run into an error again, please take a screenshot and share it with us.

Regards,
Mark

Thank you!