[Plugin: WP to Twitter] New problem

Hi i have this problem in my template “There was a problem reading your latest tweets”

I used this code in siderbar.php

<ul>
            <?php if (function_exists('get_twitter_latest_updates'))
                get_twitter_latest_updates(); ?>
        </ul>

what i need do ?

http://ww.wp.xz.cn/extend/plugins/wp-to-twitter/