shareexy seems to have stopped my wordpress from working

My site under development is

http://www.craneng.com.gridhosted.co.uk/

It is in wordpress and I don’t know much about it. Anyway, wordpress was telling me that I had three plugins that needed updating so I clicked the update button and then I got this error message…

Warning: require_once(SharexyError.php) [function.require-once]: failed to open stream: No such file or directory in /var/sites/c/craneng.com/public_html/wp-content/plugins/sharexy/sharexy.php on line 46

Fatal error: require_once() [function.require]: Failed opening required ‘SharexyError.php’ (include_path=’.:/usr/local/lib/php’) in /var/sites/c/craneng.com/public_html/wp-content/plugins/sharexy/sharexy.php on line 46

And now my wordpress site won’t open at all… I just keep getting the same message.
Please can you tell explain what I need to do to see my site again?

Any help gratefully received.

http://wordpress.org/extend/plugins/sharexy/