Cannot redeclare function

[carlosromans]

Hi, i'm using this useful snippet on WordPress, but when i follow all steps i see this message on footer.php

Cannot redeclare timeAgo() (previously declared in /path/to/theme/inc/twitter/twitter.php:54) in /path/to/theme/inc/twitter/twitter.php on line 84

On twitter.php i call oauth:

// Require the OAuth class
require_once('twitter-api-oauth.php');

And on footer.php

<?php require get_template_directory() . '/inc/twitter/twitter.php'; ?>

Any suggest?