Add context.

app/src/main/res/layout/fragment_authentication_server.xml

@@ -2,6 +2,7 @@
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="match_parent">
+    tools:context=".authentication.server.ui.ServerFragment">
 
     <TextView
         android:id="@+id/text_headline"