私もskさんと同じようなエラーで、アップロードしたServices/フォルダのTwitter.phpを開くと
Warning: require_once(Services/Twitter/Connector.php) [function.require-once]: failed to open stream: No
such file or directory in /usr/local/www/htdocs/ユーザーID/public_html/Services/Twitter.php on line 23
というものと
Fatal error: require_once() [function.require]: Failed opening required
'Services/Twitter/Connector.php'(include_path='.:/usr/local/lib/php')
in /usr/local/www/htdocs/ユーザーID/public_html/Services/Twitter.php on line 23