Error in Android Android Google Maps android Failed to load map. Failed to contact Google servers. "

I am trying to implement google maps in my Android application, but I am stuck with the error " android Failed to load map. Could not contact Google servers." I turned on the google game library, got the key using the SHA1 certificate thumbprint. I received the SHA1 certificate fingerprint as:

 sudo keytool -v -list -alias androiddebugkey \-keystore /home/.android/debug.keystore

I managed the manifest file according to This

now I can not find the cause of this error .. any suggestion is much appreciated ...

• I saw stackoverflow questions but got no solution!

EDIT : my manifest file permissions are as follows:

<permission
    android:name="PAKG_NAME.permission.MAPS_RECEIVE"
    android:protectionLevel="signature" />

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


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


.....................

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

and my xml layout has a snippet like:

  <fragment
            android:id="@+id/map"
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_marginLeft="10dp"
            android:layout_marginRight="10dp"
            class="com.google.android.gms.maps.SupportMapFragment" />

Logcat Output:

 E/Google Maps Android API(31478): Failed to load map.  Could not contact Google servers.