Warning: require(application/config/constants.php): failed to open stream: No such file or directory in C:\sistemas_web\system\core\CodeIgniter.php on line 64

Fatal error: require(): Failed opening required 'application/config/constants.php' (include_path='.;C:\xampp\php\PEAR') in C:\sistemas_web\system\core\CodeIgniter.php on line 64