I've never even heard of Power Apps when someone dropped a huge app on me. Now the users are reporting the error (see title of this post).
Looking at the app in the editor - the screen in question is like a bunch of other screens in the app, with an icon to save and go to the next screen. I cannot find a "patch" call anywhere, the icon just calls:
If(varLocked, Navigate(AssessmentHealth2), (Set(blnBack, false) && SubmitForm(AssessmentForm24)));
Looking at the documentation for SubmitForm (https://docs.microsoft.com/en-us/power-platform/power-fx/reference/function-form) isn't helping me much.
How do I fix this, I don't even know where to start.