Show dialog notifier don't work

MIT App Inventor Help
1

I want to delete a list item when i click a button but show dialog notifier don't work!

These are my blocks:

blocks (3)
blocks (3)1102×670 82.4 KB

blocks (4)
blocks (4)1078×434 53.3 KB

Why??? What am i wrong?

2

Does the notifier alert show the value of global noselmes ?

Do not rely on listUsers.Elements as a list. Make an AI2 list to hold the vlaues for users, and set this as your listUsers.elements for display. Delete the user from the list, then reload the elements.

Also use length of list instead of selectionIndex.

3

Yes it is a simple text message like "No selection or empty list"

4

Well, if that is showing, then it means that

image

is not true