android - "Failed to load map" error contacting Google servers -

i have checked threads topic following advices , tutorials have same problem.

the strange thing have created sample project same configuration , it works! , works if change api key don't know if problem key or not.

manifest file:

<permission     android:name="mypackage.permission.maps_receive"     android:protectionlevel="signature"/> <uses-permission android:name="mypackage.permission.maps_receive"/> <uses-permission android:name="android.permission.internet"/> <uses-permission android:name="android.permission.write_external_storage"/> <uses-permission android:name="android.permission.access_wifi_state"/> <uses-permission android:name="com.google.android.providers.gsf.permission.read_gservices"/> <uses-permission android:name="android.permission.access_coarse_location" /> <uses-permission android:name="android.permission.access_fine_location" /> <uses-permission android:name="android.permission.access_network_state"/> <uses-permission android:name="android.permission.write_external_storage"/>     <uses-sdk     android:minsdkversion="10"     android:targetsdkversion="10" />   <uses-feature     android:glesversion="0x00020000"     android:required="true"/> 

inside application tag:

 <meta-data     android:name="com.google.android.maps.v2.api_key" android:value="my api key"/> 

activity:

 public class mapaactivity extends fragmentactivity{  private googlemap mmap;   @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);      setcontentview(r.layout.mapa);      setupmapifneeded(); }  @override protected void onresume() {     super.onresume();     setupmapifneeded(); } private void setupmapifneeded() {     if (mmap == null) {                     mmap = ((supportmapfragment) getsupportfragmentmanager().findfragmentbyid(r.id.map)).getmap();          if (mmap != null) {             setupmap();         }     } }  private void setupmap() {     mmap.addmarker(new markeroptions().position(new latlng(40, 12)).title("marker"));     } } 

are running both apps same keystore? api key should created along sha1 fingerprint , package name might missed logic.