Plugin Error

Fatal error: Uncaught Error: Non-static method DOMDocument::loadHTML() cannot be called statically in /var/www/html/wp-content/plugins/supplier-and-purchase-order-management-for-woocommerce/views/supplierprofile.php:596 Stack trace: #0 /var/www/html/wp-content/plugins/supplier-and-purchase-order-management-for-woocommerce/supplier-plugin.php(209): include_once() #1 /var/www/html/wp-includes/class-wp-hook.php(308): spom_supplier_profile_call() #2 /var/www/html/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #3 /var/www/html/wp-includes/plugin.php(517): WP_Hook->do_action() #4 /var/www/html/wp-admin/admin.php(259): do_action() #5 {main} thrown in?/var/www/html/wp-content/plugins/supplier-and-purchase-order-management-for-woocommerce/views/supplierprofile.php?on line?596