When I submit the sample form after carefully following the configuration process for formmail.php, I get the following error message from formmail.php:

Warning: Unknown(C:\php\prepend.php): failed to open stream: No such file or directory in Unknown on line 0

Warning: (null)(): Failed opening 'C:\php\prepend.php' for inclusion (include_path='.\;C:\php\PEAR') in Unknown on line 0

Can anyone explain why this is happening?