I've been updating my site and trying some new plugins. This message appeared at the top of my site's page. I didn't notice which plugin install preceded the problem, if it is due to a plugin at all.
Please help. Here is the error message.
Warning: join() [function.join]: Invalid arguments passed in /hermes/bosoraweb129/b1596/nf.borderlandteachers/public_html/wp-includes/post-template.php on line 394 class="">
My site is http://www.borderlandteachers.ca