google service account example returns "Error refreshing the OAuth2 token { “error” : “invalid_grant” }"

Question

My goal is to make the simplest query on Google Fusion Tables on behalf of my web app users. For that, I created a service account on google console. Here is the code:

    // Creating a google client
    $client = new \Google_Client();


    // setting the service acount credentials
    $serviceAccountName = 'XXXXX.apps.googleusercontent.com';
    $scopes= array(
                'https://www.googleapis.com/auth/fusiontables',
                'https://www.googleapis.com/auth/fusiontables.readonly',
                );
    $privateKey=file_get_contents('/path/to/privatekey.p12');
    $privateKeyPassword='notasecret'; // the default one when generated in the console

    $credential = new \Google_Auth_AssertionCredentials($serviceAccountName,
            $scopes, $privateKey, $privateKeyPassword);

    // setting assertion credentials
    $client->setAssertionCredentials($credential);

    $service = new \Google_Service_Fusiontables($client);
    $sql = 'select name from XXXXXXXX'; 
    $result = $service->query->sql($sql);

After running this code, I got this error:

Error refreshing the OAuth2 token, message: '{
"error" : "invalid_grant"
}'

I googled that for days and most of answers are talking about refreshing the token. I made this refresh but still the same errors!

Any idea for solving this problem? Thanks

Answer 1

In my case it was caused by the server's time being too far off (about 5 minutes).

Although your issue is already solved, maybe this is of any help for someone who lands here in the future as the error returned by Google is the same.