I have got the same trouble today when updating the sociable plugin with a general message of fatal error everywhere... I came here to post my question and here is the 1st answer I got.
Even so as I am not a soft engineer I still cann't manage the situation and have no more access to my dashboard and extensions as everywhere appears this so interesting message :
Fatal error: Undefined class name 'self' in /homez.378/laverite/www/wp-content/plugins/sociable/includes/class-sociable_Admin_Options.php on line 63
I cann't access anymore to the dashboard and to any extension uploaded from wordpress...The Fatal error message is all over the place; no button from the dashboard is actually working normally!
Here is the 1st feedback from the forum I got. It must be of importance but even so, I still need some help.
"FTP into your site (or use whatever file management application your host provides) and delete the wp-content/plugins/sociable folder."
If you come to know better than I do how to manage the situation just send me a message via the forum, if this one is of any help!
I am french and need to greatly understand step by step what to do!