How to solve Runtime Error

App Inventor for iOS
1

What is meaning of this photo,How can I solve this problem.

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17008906047541920×1440 220 KB

2

The error tells you exactly the problem. You are trying to get first item from an empty list. Use Do it to debug your blocks.

3

Thankyou.What about this? How can I solve this problem?

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17008930406951920×1440 132 KB

4

Check all blocks that use select list item list ..index ..Check your lists , for example if you use a database such as firebase or tinyDB maybe you don't get get values . As I said connect companion and use Do it to find which precedure causes the problem

animation58

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5

(Canned Reply: ABG- Export & Upload .aia)
Export your .aia file and upload it here.
export_and_upload_aia

6

So the upstream question is

Why is my list empty?

  • You asked for the data from something slow (file, web,...) but expected it to appear immediately

  • You are running your app for the first time, and did not consider that you need to load some data into it

  • You asked for data from BlueTooth but did not get any data yet

  • what did I miss?