Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate

May have to increase the amount of memory a PHP script may consume
1. If you have access to your PHP.ini file, change the line in PHP.ini
If your line shows 8M try 16M:
memory_limit = 16M ; Maximum amount of memory a script may consume (16MB)
2. If you don’t have access to PHP.ini try adding this to an .htaccess file:
php_value memory_limit 16M
3. Talk to your host.

You might also try disabling Plugins if you can’t increase PHP memory. I understand some plugin such as Google Sitemap use quite a bit of memory.
Resource:
How to deactivate all plugins when not able to access the administrative menus?

Duplicate so see:
http://wordpress.org/support/topic/194370?replies=16