set up multiple applications

Hi,
I tried that :
In my htaccess located in code_igniter directory :

Code:

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule application1/test code_igniter/generic_test.php/generic_controller

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule application1/prod code_igniter/generic_prod.php/generic_controller [L]
</IfModule>

 
In route.php in /code_igniter/applications/generic_test/config :

Code:

$route['default_controller'] = 'generic_controller';

In config.php in /code_igniter/applications/generic_test/config :

Code:

$config['base_url'] = 'http://localhost/code_igniter';

In index.php in code_igniter directory : 

Code:

$application_folder = 'applications/generic_test';

When I run http://localhost/application1/test I've got "The requested URL /application1/test was not found on this server".

I checked my rewrite rule on a the site https://htaccess.madewithlove.be/ and "http://localhost/application1/test" should produce "http://localhost/code_igniter/generic_test.php/generic_controller"

So I don't understand what's wrong.

Thanks for your help