You can try each one of these:
-
Go to WordPress Dashboard > Settings > Permalinks and simply hit Save Changes.
-
Make sure there’s no
index.html
in your website’s root directory (i.e. the directory in which WordPress files are located). -
Create an .htaccess file in your
wp-admin
directory with the following contents:<IfModule mod_security.c> SecFilterEngine Off </IfModule>
-
And oh, the quickest way to figure out what’s wrong would be to edit your wp-config.php and set:
define( 'WP_DEBUG', TRUE ); // default is FALSE
Fix any errors that you see and see if that fixes the problem.
Source: Google Search