Fatal error: Uncaught Error: Undefined constant "Y" in /home/yousef9/public_html/lang/fa.php:17 Stack trace: #0 /home/yousef9/public_html/template/template1/include/header.php(27): include() #1 /home/yousef9/public_html/product_view.php(3): include_once('/home/yousef9/p...') #2 {main} thrown in /home/yousef9/public_html/lang/fa.php on line 17