Не удалось слияние манифеста: uses-sdk: minSdkVersion 8 не может быть меньше

Проблема в том, что..

Error:Execution failed for task ':app:processDebugManifest'.

Не удалось выполнить манифест слияния: uses-sdk: minSdkVersion 8 не может быть меньше версии L, объявленной в библиотеке com.android.support:support-v4:21.0.0-rc1

Код в build.gradle

   apply plugin: 'android'

android {
    compileSdkVersion 19
    buildToolsVersion "20.0.0"

    defaultConfig {
        applicationId "com.androidexample.gcm"
        minSdkVersion 8
        targetSdkVersion 16
    }

    buildTypes {
        release {
            runProguard false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}

dependencies {
    compile 'com.android.support:support-v4:+'
    compile 'com.google.android.gms:play-services:+'
    //compile 'com.android.support:support-v4:20.0.0'
    //compile 'com.google.android.gms:play-services:5.0.77'

}

Код в AndroidManifest есть..

 <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidexample.gcm"
    android:versionCode="1"
    android:versionName="1.0" >

    <!-- GCM requires Android SDK version 2.2 (API level 8) or above. -->
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />

    <!-- Main activity. -->
    <application
        android:name="com.androidexample.gcm.Controller"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <!-- Register Activity -->
        <activity
            android:name="com.androidexample.gcm.RegisterActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <action android:name="android.intent.action.DELETE" />
                <category android:name="android.intent.category.DEFAULT" />  
                <data android:scheme="com.idrivecare.familypro" />
            </intent-filter>
        </activity>


        <!-- Main Activity -->
        <activity
            android:name="com.androidexample.gcm.MainActivity"
            android:configChanges="orientation|keyboardHidden"
            android:label="@string/app_name" >
        </activity>

        <receiver
            android:name="com.google.android.gcm.GCMBroadcastReceiver"
            android:permission="com.google.android.c2dm.permission.SEND" >
            <intent-filter>

                <!-- Receives the actual messages. -->
                <action android:name="com.google.android.c2dm.intent.RECEIVE" />
                <!-- Receives the registration id. -->
                <action android:name="com.google.android.c2dm.intent.REGISTRATION" />

                <category android:name="com.androidexample.gcm" />
            </intent-filter>
        </receiver>

        <service android:name="com.androidexample.gcm.GCMIntentService" />
        <meta-data android:name="com.google.android.gms.version" android:value="@integer/google_play_services_version" />
    </application>

    <!-- GCM connects to Internet Services. -->
    <uses-permission android:name="android.permission.INTERNET" />

    <!-- GCM requires a Google account. -->
    <uses-permission android:name="android.permission.GET_ACCOUNTS" />

    <!-- Keeps the processor from sleeping when a message is received. -->
    <uses-permission android:name="android.permission.WAKE_LOCK" />

    <!-- Creates a custom permission so only this app can receive its messages. -->
    <permission
        android:name="com.androidexample.gcm.permission.C2D_MESSAGE"
        android:protectionLevel="signature" />

    <uses-permission android:name="com.androidexample.gcm.permission.C2D_MESSAGE" />

    <!-- This app has permission to register and receive data message. -->
    <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />

    <!-- Network State Permissions to detect Internet status -->
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

    <!-- Permission to vibrate -->
    <uses-permission android:name="android.permission.VIBRATE" />

</manifest>

Спасибо, сэр..