Api google map key where we could find

this error showed while building the app , " ERROR: Please specify Google Maps API key in Project Settings > API Keys > Google Maps API Key."

the message says it all.

ok , but the question why should i need to put API key since i dont use google map

Okay, so your question was poorly worded.
Show which extensions you’re using in the project.

Are you sure? That message only appears if you have a Google Maps component in at least one of the screens.