I have implemented GoogleLogin which is working in debug mode, But in release it is not working and throw an error "Developer Error", I don't understand that what is the issue and also having some queries about firebase. 1). If i have created an app with XYZ package id then can i create second app with that package id XYZ in firebase(firebase opened with different gmail account)? 2). If i have created an app in firebase with XYZ id then what we should do to create app with that created package id(XYZ)? Should i delete old app ? OR I can't create app with a package id which is either deleted or not?