I made a fatal mistake in upgrading my main site to 3.5 a couple of weeks ago and now I am unable to add or edit anything on the site.
For example if I attempt to create a new Post, I get the following error message:
Related post widget
Fatal error: Class 'SimplePie_HTTP_Parser' not found in /home/logic52/public_html/HEALTH/HWI/wp-includes/SimplePie/File.php on line 133
I am unable to move or delete any Widgets as they are frozen.
I use the Graphene Theme and my plugins are all latest versions.
Any help greatly appreciated!