title: pyfcm.errors.AuthenticationError: There was an error authenticating the sender account
body: <p>I am new to FCM in python.</p>
  
  <pre><code>    raise AuthenticationError("There was an error authenticating the sender account")
  pyfcm.errors.AuthenticationError: There was an error authenticating the sender account
  </code></pre>
  
  <p>While sending the push notification to the android device I am getting an error like this.</p>
  
  <p>The code for the desire problem is here ==></p>
  
  <pre><code>registration_id = "&lt;device token&gt;"
  message_title = "title"
  message_body = "test notification"
  result1 = push_service.notify_single_device(registration_id=registration_id, message_title=message_title, message_body=message_body)
  
  print(result1)    
  </code></pre>
  
  <p>Please guide to solve the desire problem.</p>