Help with list problem

MIT App Inventor Help
1

I keep getting the following popup, but I don't know what it means,

Saved00
Saved001080×2408 134 KB

Here are my blocks pertaining to the error...
Saved
Saved1254×414 53 KB

Saved01
Saved011306×418 54.4 KB

Saved02
Saved021150×1198 156 KB

Saved03
Saved031482×474 67 KB

Help please. TIA

2

valueIfTagNotThere should be a create empty list block

Screenshot_20250614_083252_DuckDuckGo
Screenshot_20250614_083252_DuckDuckGo1080×997 157 KB

Taifun

3

Thank you @Taifun.
Somthing so simple, and it kept me baffled for days.

4

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