Error: Data structure returned is not convertible in the requested format. Try to call this method with the parameters '&format=original&serialize=1'; you will get the original php data structure serialized. The data structure looks like this: $data = array ( 0 => array ( 'login' => 'anonymous', 'email' => 'anonymous@example.org', 'superuser_access' => true, 'date_registered' => '2020-10-26 21:56:37', 'role' => 'superuser', 'capabilities' => array ( ), 'last_seen' => '00:37:13', 'uses_2fa' => false, ), 1 => array ( 'login' => 'dejiakintade', 'email' => 'deji.akintade@crowdyvest.com', 'superuser_access' => false, 'date_registered' => '2021-07-15 08:06:18', 'role' => 'noaccess', 'capabilities' => array ( ), 'uses_2fa' => false, ), 2 => array ( 'login' => 'godmode', 'email' => 'yemi.adedapo@crowdyvest.com', 'superuser_access' => true, 'date_registered' => '2020-10-26 21:56:54', 'role' => 'superuser', 'capabilities' => array ( ), 'last_seen' => '349 days 05:35:34', 'uses_2fa' => false, ), 3 => array ( 'login' => 'tony', 'email' => 'tony.udomiaye@crowdyvest.com', 'superuser_access' => false, 'date_registered' => '2021-02-24 09:04:37', 'role' => 'noaccess', 'capabilities' => array ( ), 'last_seen' => '420 days 17:52:58', 'uses_2fa' => false, ), );