[SOLVED] form_validation fails when I try to run it.

[eluser]GSV Sleeper Service[/eluser]
error message :

An Error Was Encountered
Unable to load the requested language file: language/form_validation_lang.php

why is it looking for language/form_validation_lang.php?
I have set the default language in config.php to

Code:

$config['language'] = "english";

it should be looking for language/english/form_validation_lang.php

any idea what's going wrong?

update : a colleague had made MY_Language.php and forgot to tell anyone else about it!