List index smaller than 1

Hi, I'm still new with MIT App Inventor. Can anyone help me for this error. It happen on my checkout screen and reciept screen.

it looks like the startValue is not in list of Model.

May I know what you mean by that?

in screen. initialize event, remove all your blocks, add one line:

set label.text to get Start Value.

then tell us what is showing.

Nevermind, I already fix it. It was missing get startValue. Thank you very much.

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