In your google-services.json firebase url is missing.
- Delete the existing google-servies.json from your asset
- Go to firebase console (already uploaded this app mean, delete it)
- Add this app using exact app name (your app name is com.dzubair387.workmeet)
- finsih the formalities
- Download the google-services.json(if already present in your downloaded folder, pleas move it somehwere or delete it, if not it will rename)
- Now upload the newly download google-services.json in to the app asset and compile your app.(Name should be like this only google-services.json, app wont work if any extra letters present)
Enjoy..
See your app working fine,
Note: I have deleted your app
I checked with my firebase googleservice and working fine. So this is your problem. You proceed what i suggest. All the best
Also delete the project bucket present in the designer mode