Plugins error

[eluser]chinedubond[/eluser]
Hello,
trying to use PHPmailer instead of the email class.
so i got PHPMailer.
copied three file into system/application/plugins folder
but i keep getting this error.

in my controller constructor
i put

Code:

$this->load->plugin('phpmailer');

Code:

An Error Was Encountered

Unable to load the requested file: plugins/phpmailer_pi.php

Please help thanks