Werid Error: (string required. Irritants: (#undefined))

MAINPROJECT.aia (5.1 MB)

I honestly have no idea where the error is coming from, I tried adding an Screen.ErrorOccured on each screen to try and catch it but none of them got anything at all. The error only pops up when it’s connected to

You left those empty.

Add a message Notifier with an Okay button to yell out the errors.

Importing your project throws an error in companion.

Exporting and reimporting seems to fix it ( and no irritants error shows up )

Are you testing this on an iPhone or an iPad?

(Editted to fill in details - ABG)

I remember seeing a zero length crumb of a file remix_history in the aia file project properties subdirectory, in addition to the standard project properties text file.

That suggests residue from an interrupted process, like a file writing operation.

The nonstandard file name suggests recent aia file surgery or migration from a foreign service.

I also experienced transitory session error popups when switching screens, though I encountered no rubble in the block editor.

I remember coming back to the Designer once to find the component pallets missing.

This suggests interrupted building of the Designer interface.

This project has a multi megabytes Rick roll video, straining some server resource.

So I recommend a clean export and migration to the code server as a cleanup exercise.

P.S. this post was moved from another thread, where it did not belong.

Tested it on an Iphone, with the IOS companion app.

MAINPROJECT-1.aia (5.1 MB)

like this?

Your app tests clean on an Android phone Companion from
http://code.appinventor.mit.edu

Error still occuring on this version sadly

Some Sensor components appear to be incomplete and/or incorrectly implemented:
@ewpatton (tested on iOS 26.3 with Companion)

See also here: https://doesappinventorrunonios.com/

Without switching to screen Extension_Activities it works fine for me.

Interesting. This is a different version of AI than we’ve been using - we use ai2.appinventor.mit.edu

When I tried it from your link, I was able to run the app on my iPhone.

Thank you!

No, I get the same error message there as well. (→ https://code2.appinventor.mit.edu/).

The main server and the code server differ only in terms of the app size limit.

And that doesn't matter for your app in this case.