Xamarin Facebook API Erronious Code

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" android:versionCode="1" android:versionName="1.0" package="de.nwt.vegas_vision">
    <uses-sdk android:minSdkVersion="17" />
    <uses-permission android:name="android.permission.INTERNET" />
    <application android:label="Vegas Vision">
    </application>
    <!-- BEGIN: Stuff required for Facebook API -->
    <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/fb_app_id" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <activity android:name="com.facebook.FacebookActivity" android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation" android:theme="@android:style/Theme.Translucent.NoTitleBar" android:label="@string/app_name" />
    <!-- END: Stuff required for Facebook API -->
</manifest>