Error: Class not found when unmarshalling: com.facebook.login.Login Client Request

Question

I am getting this error when hitting the \"Login With Facebook\" (Simple login button).

I have Google, and read other topics here - but I can not see any thing mat

Answer 1

I have struggled with this problem and I fixed with multidex enabled

add this in your build file

multiDexEnabled true

also this code in your activity

@Override   
protected void attachBaseContext(Context context) {
         super.attachBaseContext(context);
         MultiDex.install(this);
}

after adding this in your build gradle dependencies

compile 'com.android.support:multidex:1.0.1'

Answer 2

This can happen when the user has the native Facebook App installed.

You can suppress the attempt to open it by initializing the LoginManager's LoginBehaviour:

 // Don't allow the Facebook App to open.
 LoginManager.getInstance().setLoginBehavior(LoginBehavior.WEB_VIEW_ONLY);