AdManagment shows error on add ads

[sabrys56]

I'm us SMF 2.0.15 and AdManagment 3.5b
I us a manual install
I add ads and cilck add
I get this error
Forbidden
You don't have permission to access /index.php on this server.
Additionally, a 403 Forbidden error was encountered while trying to use an ErrorDocument to handle the request.

[vbgamer45]

Check out this
https://wiki.simplemachines.org/smf/Mod_security_-_Having_problems_with_mod_security

[sabrys56]

I upload new .htaccess. file with this code
<IfModule mod_security.c>
   # Turn off mod_security filtering.
   SecFilterEngine Off

   # The next part below probably is not needed, but better safe than sorry.
   SecFilterScanPOST Off
</IfModule>

but i get same error
i us a-ads.com

[vbgamer45]

You may have to contact your host to disable mod_security.

[sabrys56]

You may have to contact your host to disable mod_security.

I disable mod_security but i get same error
I us a-ads.com ads

[vbgamer45]

I would check with your host. SOmetimes .htaccess is not enough