How do I hide an error pop-up

hi friend, I am very new MIT app inventer
I'd like to hide/not show up a error pop-up massage as picture.
The pop-up can be ignored .. app can operate contimue.
How to hide it please and thank alot.

Test length of list > 23 before trying to select list item 24.

You need to check the length of list before accessing any item from it.

here is my code.

I try this code is work fine. thanks a lot friend.

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thanks friend.

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Spotted an error in your .Receive Text Block:

To get all of the data, use Maths Block '-1'

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