title: Google Developer Couldn't create OAuth client for Google sign in
body: <p>I'm trying to use <a href="https://developers.google.com/identity/sign-in/android/" rel="noreferrer">https://developers.google.com/identity/sign-in/android/</a> to make log in with google inside my android app, but when trying to configure a project using my project package ans SHA1 key I got this error </p>
  
  <pre><code>Couldn't create OAuth client
  warning
  Requested entity already exists
  </code></pre>
  
  <p>I searched if I create a project before with this package and SHA and find my co-worker using it in a previous project he tried to add it and got the same warning then he deleted it and I try using my project again but the problem still exists. </p>