Unable to Access Application:

Unable to Access Application:

Whenever I try to access my application from the desktop, say I am editing it and want to test something in the desktop environment I get:

An error has occurred.
An internal error has occurred. Please check the URL , or try refreshing the page


I can edit the app just fine, and I can make changes that are visible on the app to users on the mobile app. I tried another browser, same issue. I'm worried about making additional changes, sinc they may not work.