Fatal error: Uncaught Stripe\Exception\InvalidArgumentException: $config must be a string or an array in /var/www/html/rco_website/application/libraries/stripe-php/lib/BaseStripeClient.php:55 Stack trace: #0 /var/www/html/rco_website/application/controllers/cart.php(33): Stripe\BaseStripeClient->__construct() #1 /var/www/html/rco_website/system/core/CodeIgniter.php(308): Cart->__construct() #2 /var/www/html/rco_website/index.php(206): require_once('...') #3 {main} thrown in /var/www/html/rco_website/application/libraries/stripe-php/lib/BaseStripeClient.php on line 55