谷歌地图出错

Question

我有这样的错误：Google Maps Android API：无法加载地图。联系Google服务器时出错这可能是一个身份验证问题（但可能是由于网络错误）

我必须说我已经使用调试密钥库请求了API密钥，并且我确实拥有所需的权限。这是我的清单：

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

    <uses-permission android:name="com.example.googlemaps.permission.MAPS_RECEIVE" />

    <uses-sdk
        android:minSdkVersion="12"
        android:targetSdkVersion="17" />


    <permission
        android:name="com.tripin.corinaracasan.tripin.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />


    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MyActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:label="@string/app_name" android:name=".MarkItemClass"/>

        <uses-library android:name="com.google.android.maps" />

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="................................." />

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

</manifest>