Just recently this error message appears when the "View all events" link is clicked on my home page. I've been using this plugin successfully for months, this is a new problem. What do I need to do to fix this?
I'm running Atahaulpa 3.4.9 on Wordpress 3.1 . The plugin is The Events Calendar by Shane & Peter.

I experienced so many issues with The Events Calendar ....that I changed to Joe Dolson's My Calendar http://wordpress.org/extend/plugins/my-calendar/ and honestly, it really is simply the best!

Can someone take a look at these links and give me a fix. My host recently moved all the files and I'm thinking something was goofed up in the move.

Have you checked with the plugin author?

if you switch to twenty-ten and have the same issue then it's not theme related.