Posts by Murillo Rodrigues da Silva • 1 point

• -2

  votes

  1

  answer

  24

  views

  Q: Error calling com.facebook.login.widget.Loginbutton.registerCallback' method on a null Object Reference

  Whenever I start the application this error appears: Attempt to invoke virtual method 'void com.facebook.login.widget.LoginButton.registerCallback(com.facebook.CallbackManager,…

  android

  asked 4 years, 6 months ago Murillo Rodrigues da Silva 1