Fatal error: Uncaught TypeError: spl_autoload_register(): Argument #1 ($callback) must be a valid callback or null, function "WC_Session" not found or invalid function name in /home/hfbil/public_html/wp-content/plugins/woocommerce/includes/class-wc-session-handler.php:6 Stack trace: #0 [internal function]: spl_autoload_register('WC_Session') #1 /home/hfbil/public_html/wp-content/plugins/woocommerce/includes/class-wc-session-handler.php(6): class_exists('WC_Session') #2 /home/hfbil/public_html/wp-content/plugins/woocommerce/woocommerce.php(258): include_once('/home/hfbil/pub...') #3 /home/hfbil/public_html/wp-content/plugins/woocommerce/woocommerce.php(153): WooCommerce->includes() #4 /home/hfbil/public_html/wp-content/plugins/woocommerce/woocommerce.php(116): WooCommerce->__construct() #5 /home/hfbil/public_html/wp-content/plugins/woocommerce/woocommerce.php(551): WooCommerce::instance() #6 /home/hfbil/public_html/wp-content/plugins/woocommerce/woocommerce.php(555): WC() #7 /home/hfbil/public_html/wp-settings.php(304): include_once('/home/hfbil/pub...') #8 /home/hfbil/public_html/wp-config.php(91): require_once('/home/hfbil/pub...') #9 /home/hfbil/public_html/wp-load.php(37): require_once('/home/hfbil/pub...') #10 /home/hfbil/public_html/wp-blog-header.php(13): require_once('/home/hfbil/pub...') #11 /home/hfbil/public_html/index.php(17): require('/home/hfbil/pub...') #12 {main} thrown in /home/hfbil/public_html/wp-content/plugins/woocommerce/includes/class-wc-session-handler.php on line 6