I’m trying to get version 1.x of auth0-drupal module working with Drupal 7. Everything works fine until I log in and return to the callback page, at which point I get Fatal error: Class ‘OAuth2\Client’ not found in /[path]/sites/all/modules/contrib/auth0-drupal/vendor/auth0/auth0-php/src/Auth0.php …

Class OAuth2\Client not found

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