Invalid destinationAddress error app inventor

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.