Just now when I log in to my wp website, the wordpress update was available and I hit update. After that, it returned error page with "The page you were looking for could not be found. Perhaps, you should try the built in search?". Now, I can't access my dash-board or do any posts and play around with plugins.
The site url was like this after I hit wordpress upgrade (www.mywebsite.com/blog/wp-admin/upgrade.php?_wp_http_referer=%2Fblog%2Fwp-admin%2F)
I tried http://www.mywebsite.com/blog/wp-admin but, I can only login but can't access dashboard to post, add pages, add plugins or anything with wordpress.