Warning: require(functions.php): Failed to open stream: No such file or directory in C:\xampp\htdocs\index.php on line 1

Fatal error: Uncaught Error: Failed opening required 'functions.php' (include_path='C:\xampp\php\PEAR') in C:\xampp\htdocs\index.php:1 Stack trace: #0 {main} thrown in C:\xampp\htdocs\index.php on line 1