Sudden error after monts of smooth operation: "Error at on submit script".

Sudden error after monts of smooth operation: "Error at on submit script".

Hi Everyone :).

I have a creator app running smoothly for a few months now. A colleague of mine was adding assets this morning when she suddenly received an error : "Error details:Error at on submit script."

I then tried myself and got the same error.

Do you know what could cause this ? Nothing changed on the app (I am the only one who can modify it, and it's remained untouched for weeks).
Also, how could I debug this ? :(



Thanks for the help,
Guillaume