I updated my wordpress install earlier.. Firstly I was checking site as it looked like a hacker had been in and had a little play with my ban system.. Anway I updated wordpress while I was at it, and got this error..
Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, '_show_post_preview' was given in xxxxxxxxxxxxxxxxxxxxx/wp-includes/plugin.php on line 429
Since then I have not been able to get back in the dashboard, and no members can login either.. The site works bar the login for members and me. I have deactivated the plugins and reactivated them via ftp to check for plugin problems, but as yet found none causing trouble..
I am at a loss to find a soltion, usually I find one on the forum here, but have found nothing thats why I am asking for help.. the site is The God Light Thanks in advance for those that might reply..