title: Authentication issue in Google Cloud Client Library
body: <p>I am setting up the google cloud client library from the below url:</p>
  
  <p><a href="https://cloud.google.com/bigquery/docs/reference/libraries#client-libraries-usage-php" rel="nofollow noreferrer">https://cloud.google.com/bigquery/docs/reference/libraries#client-libraries-usage-php</a></p>
  
  <p>I have created a key from the given url:</p>
  
  <p><a href="https://console.cloud.google.com/apis/credentials/" rel="nofollow noreferrer">https://console.cloud.google.com/apis/credentials/</a></p>
  
  <p><a href="https://i.stack.imgur.com/HJtUq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HJtUq.png" alt="enter image description here"></a></p>
  
  <p>and set it up in the environment variable.</p>
  
  <p>but i am getting the below error:</p>
  
  <p><a href="https://i.stack.imgur.com/KmcFv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/KmcFv.png" alt="enter image description here"></a></p>
  
  <p>Please help.</p>