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I follow the guide to create a google map sample, but it always throw following error. E/Google Maps Android API(27821): Failed to load map. Could not contact Google servers. permission READ_GSERVICES and debug and release keystore have been tested. They also can't resolve above problem. Could anyone tell me why it throw that error? Manifest file: <?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.where.common" android:versionCode="1" android:versionName="1.0" > <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="16" /> <permission android:name="com.where.common.permission.MAPS_RECEIVE" android:protectionLevel="signature" /> <uses-permission android:name="com.where.common.permission.MAPS_RECEIVE" /> <uses-permission android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <uses-permission android:name="android.permission.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" > <meta-data android:name="com.google.android.maps.v2.API_KEY" android:value="AIzaSyDawEkMP7gdiB4nOOkXcdUcxSA

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