users widget missing argument 3

Message Last Time (Occured) Status
Trying to get property of non-object
/wp-includes/query.php(2977) 2014-02-11 05:08:39 (50) New
Trying to get property of non-object
/wp-includes/canonical.php(98) 2014-02-11 05:09:38 (4) New
strtolower() expects parameter 1 to be string, array given
/wp-includes/widgets.php(730) 2014-02-11 05:08:34 (100+) New
strtolower() expects parameter 1 to be string, array given
/wp-includes/widgets.php(618) 2014-02-11 05:08:34 (100+) New
Missing argument 3 for wp_register_widget_control(), called in /wp-content/plugins/users-widget/widget-users.php on line 197 and defined
/wp-includes/widgets.php(727) 2014-02-11 05:08:34 (100+) New
Missing argument 3 for wp_register_sidebar_widget(), called in /wp-content/plugins/users-widget/widget-users.php on line 196 and defined
/wp-includes/widgets.php(615) 2014-02-11 05:08:34 (100+) New