Hi Community,
I set the blocks (as above picture) last year and it ran normally. But today I found the blocks didn't work when I tested it in MIT App Inventor, and it shows error :
List index smaller than 1
Select list item : Attempt to get item number 0, of the list ["........].
The minimun valid item number is 1.
I hadn't set item number 0, why system tried to get it ?
How can I fix this error ? Thanks!