FIrebase couldn't connect to my Flutter App

Every time i try to connect to Firebase through Firebase assistant in Andriod Studio ,this error pops up and i have tried searching it on google but i couldn’t find any revalant answer…
PS-I have tried other techniques(using google jason file and all,but that too didnt worked for me

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Hey, another thing you can do is go to the firebase console and create an example project. Then inside the project, you can create an android app. Give the same name as which you have in the manifest file

package="com.example.testapp" This will be in your android > app > src > main > AndroidManifest.xml

Try to register for this app. And follow the method they have given. It will be easy then. let me know if you get stuck