Could not reach Cloud Firestore backed

Could not reach Cloud Firestore backed 

Problem 

The app or the backend may respond that there is an error (red screen), saying that could not reach Cloud Firestore Backend. 

 TVLLUquN3NGtZsgq37IL144Klw42SlFaMg0LM5Bu.png

Cause

Recently, Firebase stopped creating automatically Firestore database when you create a project. 

Solution

Go in your Firebase Project, 

Click on Database->Cloud Firestore as on the picture

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If no Cloud Firestore instance is active, a pop-up will appear

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For now, select start in test mode.