Warning: require(function/function.php): failed to open stream: No such file or directory in C:\phpstudy_pro\WWW\xinertai.net\index.php on line 13

Fatal error: require(): Failed opening required 'function/function.php' (include_path='.;C:\php\pear') in C:\phpstudy_pro\WWW\xinertai.net\index.php on line 13