I removed the original content of the .htaccess file with followings:
---
Options All -Indexes
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*) index.php
AddType application/x-httpd-php .htm .html
---...
