Fatal error: Uncaught TypeError: join(): Argument #2 ($array) must be of type ?array, string given in /home/demowhmp/public_html/cart/wp-content/plugins/whmpress_whmcs_cart/inc/external/domain_fields.php:244 Stack trace: #0 /home/demowhmp/public_html/cart/wp-content/plugins/whmpress_whmcs_cart/inc/external/domain_fields.php(244): join(Array, ',') #1 /home/demowhmp/public_html/cart/wp-content/plugins/whmpress_whmcs_cart/whmpress_whmcs_cart.php(43): require_once('/home/demowhmp/...') #2 /home/demowhmp/public_html/cart/wp-settings.php(371): include_once('/home/demowhmp/...') #3 /home/demowhmp/public_html/cart/wp-config.php(77): require_once('/home/demowhmp/...') #4 /home/demowhmp/public_html/cart/wp-load.php(37): require_once('/home/demowhmp/...') #5 /home/demowhmp/public_html/cart/wp-blog-header.php(13): require_once('/home/demowhmp/...') #6 /home/demowhmp/public_html/cart/index.php(17): require('/home/demowhmp/...') #7 {main} thrown in /home/demowhmp/public_html/cart/wp-content/plugins/whmpress_whmcs_cart/inc/external/domain_fields.php on line 244