Fatal error: Uncaught Error: Using $this when not in object context in C:\xampp\htdocs\wp-content\plugins\admin-columns-pro\addons\woocommerce\templates\modal-value\order-notes.php:6 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\admin-columns-pro\addons\woocommerce\templates\modal-value\order-notes.php on line 6