.htaccess to CodeIgniter not work?

[eluser]SaSa[/eluser]
why this .htaccess to CodeIgniter not work?

Code:

RewriteEngine on

RewriteRule ^([a-z0-9_-]+)\.html$ index.php/page/$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|asset|robots\.txt)
RewriteRule ^(.*)$ index.php/$1 [L]

# this not work other work true
RewriteRule ^site/?$ site/web_design [L]

go to url .../site have error:

Code:

404 Page Not Found

The page you requested was not found.

[eluser]SaSa[/eluser]
help me...
do must change this?

Code:

$config['uri_protocol']    = 'AUTO';

[eluser]SaSa[/eluser]
I change of AUTO to PATH_INFO:

Code:

$config['uri_protocol']    = 'PATH_INFO';

that true...
Don't know find problem on the future or no!?