Fatal error:  Uncaught GuzzleHttp\Exception\ServerException: Server error: `POST https://api.sandbox.investready.com/api/wl/user/list.json` resulted in a `500 Internal Server Error` response:
{"message":"count(): Parameter must be an array or an object that implements Countable","status_code":500}
 in /var/www/investready/demo/advanced/AccredifyPHP/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php:107
Stack trace:
#0 /var/www/investready/demo/advanced/AccredifyPHP/vendor/guzzlehttp/guzzle/src/Middleware.php(65): GuzzleHttp\Exception\RequestException::create(Object(GuzzleHttp\Psr7\Request), Object(GuzzleHttp\Psr7\Response))
#1 /var/www/investready/demo/advanced/AccredifyPHP/vendor/guzzlehttp/promises/src/Promise.php(203): GuzzleHttp\Middleware::GuzzleHttp\{closure}(Object(GuzzleHttp\Psr7\Response))
#2 /var/www/investready/demo/advanced/AccredifyPHP/vendor/guzzlehttp/promises/src/Promise.php(156): GuzzleHttp\Promise\Promise::callHandler(1, Object(GuzzleHttp\Psr7\Response), Array)
#3 /var/www/investready/demo/advanc in /var/www/investready/demo/advanced/AccredifyPHP/vendor/guzzlehttp/guzzle/src/Exception/RequestException.php on line 107