Fatal error

Try increasing the memory for PHP and WordPress by putting this line in your .htaccess file:

php_value memory_limit 64M

or this line near the top of your wp-config.php file:

define('WP_MEMORY_LIMIT', '64M');

or in your php.ini, if you have access:

memory_limit = 64M;

And deactivate all plugins for a second and then reactivate them all..

You on Windows or linux hosting?

Here’s the link