Warning: require(E:/xampp/htdocs/mainfile.php): failed to open stream: No such file or directory in E:\xampp\htdocs\index2.php on line 10

Fatal error: require(): Failed opening required 'E:/xampp/htdocs/mainfile.php' (include_path='.;E:\xampp\php\PEAR') in E:\xampp\htdocs\index2.php on line 10