Errore nella cancellazione

[Nicola_Imperati]

Hello everyone,
even though I'm simply deleting a selection from the ListView, I get this error...where am I going wrong?
Regards
Nicola

[ABG]

The Index of the Selection is zero because the Selection is not in that list.

Either that, or nothing has been Selected yet.

It's unfortunate that you had to find this out so late, instead of explicitly testing for those cases before attempting the remove from list.

[Nicola_Imperati]

But if in the ListView the first selected element corresponds to 1, how does it select element 0?

[Taifun]

@Nicola_Imperati

how does it select element 0?

From the documentation MIT App Inventor List Blocks

Use the companion app and Do it to debug your blocks, see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools

FAQ Section: Debugging

Introductory Testing techniques, including Do It - MIT Sample Connect -> Companion sequence - @ABG How to Read and Understand a Runtime Error Message - @ABG Common Runtime Errors - @TimAI2 How to Teach Debugging thread - Feb 2025 Advanced Do It' to view procedure results, event arguments and local variables How to run Logcat How to use Do It in a loop Screen1.ErrorOccured message numbers SteveJG monster list of things you should not do How to show raw responseContent from your app wh…

Taifun

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Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by Taifun.

[ChrisWard]

See my website for ListView snippets:
https://www.professorcad.co.uk/appinventorsnippets#DelListViewItems