Not found error handlign

Author: Florian

troubleshooting/not-found.md

@@ -1,5 +1,7 @@
 # Not Found
-A **Not Found** error can be caused by different reasons.
+
+<p class="uk-article-lead">When you are faced with a 404 error even though you use a valid URL to an existing page, go through the following potential causes to fix the issue on your system.</p>
+
 
 ## Missing .htaccess File
 Verify that the `.htaccess` file is present in the root of your Pagekit folder. The `.htaccess` file is a Apache configuration file and it's hidden on Unix-based systems; as such it may not have been unpacked. If it is not present, copy it from the Pagekit package.
@@ -23,3 +25,7 @@ Uncomment the `RewriteBase /` option by removing the `#` in front of it.
 
 ## Error 404 Page
 If you receive a Pagekit styled error saying **Error 404** then your `.htaccess` is functioning correctly, but your trying to reach a page that Pagekit cannot find. The most common cause of this is simply that the page has been moved or renamed.
+
+## nginx configuration
+
+When you are using nginx instead of Apache, make sure the [server configuration](../getting-started/server-configuration.md) for nginx is correct.