Telephone contact list with the function of adding new numbers and deleting

Hello … I created a screen in my application in order to add phone numbers, as I couldn’t use TinyDB, I’m using the “File” even on my cell phone to store, but I’m not able to store the number and display it on another screen that calls “conversations”. Here follows one of my many failed attempts.cont1 cont2

cont4

Resolvido ^^
Link: https://saulo.arisa.com.br/wiki/index.php/MIT_APP_Inventor_2_-_Agenda

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