Sobre o Sistema - <br /> <b>Fatal error</b>: Uncaught Error: Undefined constant "APP_NAME" in C:\xampp\htdocs\src\views\about_system.php:11 Stack trace: #0 C:\xampp\htdocs\index.php(571): require() #1 {main} thrown in <b>C:\xampp\htdocs\src\views\about