403 Forbidden

[Invalid ID]

I just installed the plugin (already available in the Plugin Manager) for Friendly URLs for search engines and it produced the following error:

You don't have permission to access /wallpaper/index.php on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

What should I do now? Every page is giving me this error.

[Invalid ID]

Ok, I have fixed the problem by removing .htaccess from my wallpaper site.

Thanks