Catchable fatal error: Object of class WP_Error could not be converted to string in

Hi fellas-
so far so good ( i think), but today after adding some new categories, I got this error message:

Catchable fatal error: Object of class WP_Error could not be converted to string in /home/tutuolog/public_html/girlygirldirectory.com/wp-content/plugins/directory/core/template-tags.php on line 149

Not running any plugins aside from askimet, login image, and the directory plugin....pretty bare-bones at the moment.

The new site: girlygirldirectory.com
Be warned....it is hard on the eyes if you're a guy...LOL