When initializing the app I get the message "Invalid destinationAddress". for what is this? I appreciate any help
We do not know. What are you doing ?
Welcome Diego.
Does your app use the MIT Navigate control. The only place I have seen a destinationAddress error is using that control.
As Tim mention Diego, you have to provide a better description. Perhaps provide an image of your Blocks.
I don't know what you meant for, but one of the simple fixes is to define the phone number.
see also App Inventor 2: RUNTIME ERROR: Invalid Destination Address.
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app-inventor-2-invalid-destination-address