Fatal error in rootcandy_preprocess_page hook. on "/user" page

php 5.3.3
template.php
// You must use next code:
l($user_first_name, 'user', array('attributes' => array('class' => array('user-name')))))
// Insterad of:
l($user_first_name, 'user', array('attributes' => array('class' => 'user-name'))))
// Wrap class property with array