Warning: require(phpmail/install.php): failed to open stream: No such file or directory in /index.php on line 3

Warning: require(phpmail/install.php): failed to open stream: No such file or directory in /index.php on line 3

Fatal error: require(): Failed opening required 'phpmail/install.php' (include_path='.:/:/usr/local/php56/lib/pear') in /index.php on line 3