RSS Displayer Help

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I am using RSS Displayer to show two different feeds on two different pages of my website. All of the sudden they both have stopped working. Nothing has changed with either of the feeds. The existing feeds say "Oops it looks like you've entered an invalid feed address" and if I try to add a new RSS block there is an error at the top of the input dialogue that says "Warning: Creating default object from empty value in /var/www/kadant.com/concrete/blocks/rss_displayer/form_setup_html.php on line 11".

Has anyone had this problem and can help me fix it? Thanks.