Fatal error on WP 3.5.2

I get the following error where the widget should be shown on my homepage:
Fatal error: Call to undefined method WP_Error::get_link() in /home/luisaambros89/luisaambros.com/wp/wp-content/plugins/delicious-readings/delicious-readings.php on line 164

http://ww.wp.xz.cn/extend/plugins/delicious-readings/