"app did not load successfully. Please contact the app creator."

[hodgson_doug]

I don’t have this issue on my computer, but it’s an issue on my friend’s computer when accessing the app, and he is signed in and already on the Users list with full permissions to edit the Appsheet. Is anyone able to shed some light on this issue within the emulator?
The error states,
“The undefined app did not load successfully. Please contact the app creator.”
&
“An asynchronous module or handler completed while an asynchronous operation was still pending.”

Screenshot:

I’m fairly certain it can’t be an app definition fetching issue, as this is the error in the editing mode’s emulator; and there are no new errors present under the Info section. Again, no issues with loading it on my computer, just with my friend’s account who has exactly the same authority as I do (in AppSheet) and successfully has had access in the past, no longer can get it to load on either of his two computers. No new columns have been added and while he’s able to edit things in the editor, the emulator still doesn’t load.