I can't seem to solve this problem. I'm trying to add elements to ListView but it keeps giving this error

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FAQ Section: Lists

Introductory Making Lists (Concepts) - MIT Lists Chapter from MIT AI2 Online book Translatable copy of Lists Chapter from MIT AI2 Online book How to work with Lists - imagnity MIT AI2 List Blocks Help Page How to Display a List - MIT nb191 Advanced list blocks (filter, sort, map, reduce) Tables Dynamic-editable-html-table - @TimAI2 free-tableviewer-fully-style-customized-to-show-table-data (extension) - @Kevinkun Dynamic Table Layout and Table Listpicker (HTML) - @Taifun Dynamic Tab…

Read the introductory articles

You are creating lists wrong and adding to lists wrong.

I caught a quick peek at your code, and I have to recommend a recent tutorial on how to deal with not found lookups ...

How to Deal with notfound from lookups

This tutorial is an essay on how to deal with notfound return values from various lookups like lookup in pairs TinyDB lookup lookup in dict lookup in FireBase, CloudDB, etc. Sample code for this article is in ai2.appinventor.mit.edu/?galleryId=6553745952997376 or can downloaded as notfound_confound.aia (275.1 KB) Block images in this post have been downloaded using AI2's Download Blocks as Image facility, so they can be dragged directly from this post into your Blocks Editor work space. Th…