Unable to generate apk because of Firebase, Firebase config file error

To be honest I have no knowledge of Firebase.
But by looking at one of the json files that were lying around here on my PC, I saw that one line was missing in both cases

"firebase_url": "https://your-projekt-id.firebaseio.com",

if it is the right/correct one I have no idea..

  "project_info": {
    "project_number": "123456789",
	"firebase_url": "https://your-projekt-id.firebaseio.com",
    "project_id": "your-projekt-id",
    "storage_bucket": "your-projekt-id.appspot.com"
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