themes.php, plugins.php Error 324

– try deactivating ALL plugins temporarily to see if this resolves the problem. If this works, re-activate them individually (one-by-one) to find the problematic plugin(s). When you can’t get into your admin dashboard, try deactivating via FTP or SFTP or whatever file management application your host provides (also read http://codex.wordpress.org/FAQ_Troubleshooting#How_to_deactivate_all_plugins_when_not_able_to_access_the_administrative_menus.3F). Also remember to deactivate any plugins in the mu-plugins folder. The easiest way is to rename that folder to mu-plugins-old.

If you want, I can send you via email.

Please don’t, that’s really frowned upon here.

http://codex.wordpress.org/Forum_Welcome#The_Bad_Stuff

I can use my web site normally EXCEPT the page de themes.php :
mysite.com/wp-admin/themes.php

Have you tried manually updating your WordPress files?

http://codex.wordpress.org/Updating_WordPress#Manual_Update

It’s not hard but please make sure you do not delete any files and do not update wp-config.php or any files in the wp-content directory.