How to fix "The ContactPicker component have no 'After Picking' return value."

Hello. This is my first time using Kodular.

So, I tried to make an SMS app using this tutorial but when i click on ContactPicker, the textbox shows up an error “The ContactPicker component have no ‘After Picking’ return value.”
This is my block.

How do i fix this? Thank you.

Just read what the message tells you.