I have an app with a custom component, in particular a clickable map which was working fine but I have now started seeing this error.
Your app is having trouble loading the map_select.map_select component.
(The app is attempting to load the component from http://localhost:3000, and hasn’t received its "streamlit " message.)
The problem was because it was trying to run the development version. I forgot to change the environment variables so that it would run the production version.
Glad to hear that it is sorted out 
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