I had the same error...look at your email and it will tell you why this error happened. Did you delete a table from your database? Mine happened when I added a Ray widget ie...Slideshow and then deleted the database table but forgot to delete all the files. the inc/ directory was attempting to call this table and it didn't exist.

Good luck! Copy and paste the message from your email and someone will be able to help you....I ended up having to re-install the widget.