Application does not handles error effectively. when oauth token api throws an error
Error - GuzzleHttp\Exception\ClientException: Client error: `POST https://test.salesforce.com/services/oauth2/token` resulted in a `400 Bad Request` response: {"error":"invalid_grant","error_description":"expired access/refresh token"} in GuzzleHttp\Exception\RequestException::create() (line 111 of /app/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php).