Error 12501 authenticating with google sign-in

<manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.demilion.dontpoopyourpants">


    <application        android:supportsRtl="true"        android:allowBackup="true"        android:fullBackupContent="false"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >

        <meta-data android:name="com.google.android.gms.games.APP_ID"
            android:value="@string/app_id" />
        <meta-data android:name="com.google.android.gms.version"                   android:value="@integer/google_play_services_version"/>

        <activity            android:name="com.google.example.games.tanc.MainActivity"            android:label="@string/title_activity_main"            android:screenOrientation="portrait" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>