conflict with co-authors plus plugin

I’m receiving these errors on a page with a map in its template:

Warning: Missing argument 2 for coauthors_plus::posts_join_filter() in /nfs/c02/h10/mnt/30295/domains/temple-news.com/html/wp-content/plugins/co-authors-plus/co-authors-plus.php on line 507

Fatal error: Call to a member function is_author() on a non-object in /nfs/c02/h10/mnt/30295/domains/temple-news.com/html/wp-content/plugins/co-authors-plus/co-authors-plus.php on line 510

On my local development site, I receive the same errors in addition to this error:

Notice: Undefined variable: query in /Users/montchr/Documents/temple news/temple-news.com/temple-news.dev/wp-content/plugins/co-authors-plus/co-authors-plus.php on line 510

Naturally, I disabled the Co-Authors Plus plugin on my development site to test. The issue went away.

Unfortunately, my site requires the Co-Authors Plus plugin to work properly. I’ve had to remove the map from my site (temporarily, I hope).

Any suggestions?

http://wordpress.org/extend/plugins/geo-mashup/