Error inflating class com.facebook.widget.LoginButton with Facebook SDK 4.0.1

I know this is a very common question, btu I have read through all the stack overflow questions without finding an answer. I'm trying to integrate the Facebook Login Button using Facebook SDK 4.0.1 added through Gradle, but I get the following error. java.lang.RuntimeException: Unable to start activity ComponentInfo{se.speedle.android/com.bryderi.speedle.android.activity.MainActivity}: android.view.InflateException: Binary XML file line #26: Error inflating class com.facebook.widget.LoginButton at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) at android.app.ActivityThread.access$600(ActivityThread.java:141) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5103) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:525) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) at dalvik.system.NativeStart.main(Native Method) Caused by: android.view.InflateException: Binary XML file line #26: Error inflating class com.facebook.widget.LoginButton at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:707) at android.view.LayoutInflater.rInflate(LayoutInflater.java:755) at android.view.LayoutInflater.rInflate(LayoutInflater.java:758) at android.view.LayoutInflater.inflate(LayoutInflater.java:492) at android.view.LayoutInflater.inflate(LayoutInflater.java:397) at android.view.LayoutInflater.inflate(LayoutInflater.java:353) at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:228) at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102) at com.bryderi.speedle.android.activity.MainActivity.onCreate(MainActivity.java:36) at android.app.Activity.performCreate(Activity.java:5133) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)             at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)             at android.app.ActivityThread.access$600(ActivityThread.java:141)             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)             at android.os.Handler.dispatchMessage(Handler.java:99)             at android.os.Looper.loop(Looper.java:137)             at android.app.ActivityThread.main(ActivityThread.java:5103)             at java.lang.reflect.Method.invokeNative(Native Method)             at java.lang.reflect.Method.invoke(Method.java:525)             at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)             at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)             at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.ClassNotFoundException: Didn't find class "com.facebook.widget.LoginButton" on path: DexPathList[[zip file "/data/app/se.speedle.android-1.apk"],nativeLibraryDirectories=[/data/app-lib/se.speedle.android-1, /system/lib]] at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53) at java.lang.ClassLoader.loadClass(ClassLoader.java:501) at java.lang.ClassLoader.loadClass(ClassLoader.java:461) at android.view.LayoutInflater.createView(LayoutInflater.java:559) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:696)             at android.view.LayoutInflater.rInflate(LayoutInflater.java:755)             at android.view.LayoutInflater.rInflate(LayoutInflater.java:758)             at android.view.LayoutInflater.inflate(LayoutInflater.java:492)             at android.view.LayoutInflater.inflate(LayoutInflater.java:397)             at android.view.LayoutInflater.inflate(LayoutInflater.java:353)             at android.support.v7.app.ActionBarActivityDelegateBase.setContentView(ActionBarActivityDelegateBase.java:228)             at android.support.v7.app.ActionBarActivity.setContentView(ActionBarActivity.java:102)             at com.bryderi.speedle.android.activity.MainActivity.onCreate(MainActivity.java:36)             at android.app.Activity.performCreate(Activity.java:5133)             at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)             at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)             at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)             at android.app.ActivityThread.access$600(ActivityThread.java:141)             at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)             at android.os.Handler.dispatchMessage(Handler.java:99)             at android.os.Looper.loop(Looper.java:137)             at android.app.ActivityThread.main(ActivityThread.java:5103)             at java.lang.reflect.Method.invokeNative(Native Method)             at java.lang.reflect.Method.invoke(Method.java:525) I can see the LoginButton class in Android Studio, so it kind of works Here's my build.gradle dependencies dependencies { aspects 'org.robobinding:robobinding:0.8.9' compile 'org.springframework.android:spring-android-rest-template:2.0.0.M1' compile 'com.android.support:appcompat-v7:21.0.3' compile 'com.android.support:support-v4:21.0.3' compile 'com.android.support:support-v13:21.0.3' compile 'com.android.support:recyclerview-v7:21.0.3' compile 'com.fasterxml.jackson.core:jackson-databind:2.3.2' compile 'com.jakewharton:butterknife:6.1.0' compile 'com.facebook.android:facebook-android-sdk:4.0.1' compile 'me.alexrs:recyclerview-renderers:1.0.3' compile 'com.google.android.gms:play-services:6.5.87' } Here's my layout <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:facebook="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal" android:orientation="vertical" android:padding="20dp" > <com.facebook.widget.LoginButton android:id="@+id/connectWithFbButton" style="@style/com_facebook_loginview_default_style" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:layout_gravity="center_horizontal" android:text=" connect_with_facebook"/> </LinearLayout> And the relevant parts of my activity @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); FacebookSdk.sdkInitialize(getApplicationContext()); callbackManager = CallbackManager.Factory.create(); setContentView(R.layout.activity_main); // Set a Toolbar to replace the ActionBar. Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); // Find our drawer view dlDrawer = (FragmentNavigationDrawer) findViewById(R.id.drawer_layout); // Setup drawer view dlDrawer.setupDrawerConfiguration((ListView) findViewById(R.id.lvDrawer), toolbar, R.layout.drawer_nav_item, R.id.flContent); // Add nav items dlDrawer.addNavItem("Home", "First Fragment", ClassifiedsFragment.class); dlDrawer.addNavItem("Favourites", "Favourites", ClassifiedsFragment.class); dlDrawer.addNavItem("My Items", "Items", ClassifiedsFragment.class); dlDrawer.addNavItem("Settings", "Settings", ClassifiedsFragment.class); //dlDrawer.addNavItem("Second", "Second Fragment", SecondFragment.class); //dlDrawer.addNavItem("Third", "Third Fragment", ThirdFragment.class); // Select default if (savedInstanceState == null) { dlDrawer.selectDrawerItem(0); } }