Android Facebook LoginButton Callback jumps to canceled

I have the following code. It is a simple test of the callback function of the LoginButton in Facebook's Android API.

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    FacebookSdk.sdkInitialize(getApplicationContext());
    setContentView(R.layout.activity_main);
    callbackManager = CallbackManager.Factory.create();
    LoginButton loginButton = (LoginButton)findViewById(R.id.login_button);
    loginButton.setReadPermissions("user_friends");
    loginButton.setReadPermissions("email");
    loginButton.setReadPermissions("public_profile");
    loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {

        @Override
        public void onSuccess(LoginResult loginResult) {
            Log.e("SUCCESS", "LOGIN SUCCESSFUL");
        }

        @Override
        public void onCancel() {
            Log.e("CANCEL", "Cancelled");
        }

        @Override
        public void onError(FacebookException e) {
            Log.e("ERROR", "Facebook Exception");
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    callbackManager.onActivityResult(requestCode, resultCode, data);
}

The only problem is that whenever I click the loginButton, a dialog appears and disappears for a brief moment, and then the logcat prints out the "CANCEL" text. I cannot seem to fix this error, and I'm not clicking cancel, because that dialog simply shows up and immediately disappears.

Please help me fix this?