'get', 'friends/ids' not working

[Schop]

Whenever I try this:

$friends = $this->tweet->call('get', 'friends/ids', array('screen_name' => $user->screen_name));

I get errors:

 Severity: Notice
 Message: Undefined property: stdClass::$request
 Filename: libraries/tweet.php
Line Number: 205

AND

Severity: Notice
Message: Undefined property: stdClass::$error
Filename: libraries/tweet.php
Line Number: 205

The call returns 'false'. What is going on here?

[jrnbs]

I have the exact same problems with friends/ids and followers/ids. Apparently this happens because the version is not in the URL, edit http://api.twitter.com/ to http://api.twitter.com/1/ in tweet.php and it works!