I was running the up to date 2.8.something version ok, and today it showed an upgrade to 2.9. I upgraded using the automatic upgrade tool. Problem is, since the upgrade I get this error message
Catchable fatal error: Object of class wordpress_gallery_slideshow could not be converted to string in /srv/mysite.co.uk/www/wp-includes/classes.php on line 273
Can somebody help me to sort this out please?
I am a novice when it comes to WP, so could you explain in simple terms.