title: Error while running GCM sample app
body: <p>I tried to run sample application provided by google for GCM.</p>
  
  <p>www.developers.google.com/cloud-messaging/android/start</p>
  
  <p>I followed all the instructions but got following error shown in <a href="http://i.stack.imgur.com/TcudS.png" rel="nofollow">error image </a></p>
  
  <p>Edit 1:</p>
  
  <p>API key copied from developer console
  and
  API key used in my project </p>
  
  <p>check this <a href="http://i.stack.imgur.com/TbPU4.png" rel="nofollow">image</a></p>
  
  <p>as you can see that both API keys are same </p>