sitemap.php permission

Hi,

I have followed the install instructions for the simple sitemaps plugin. When I navigate to mydomain.com/sitemap.xml in my browser I get the following error:

Forbidden

You don’t have permission to access /wp-content/sitemap.php on this server.

Possible causes of this error include:

The request was forbidden by rules in the .htaccess file.

The directory you requested does not have an index.html or index.php file.

The permissions on the file or directory are incorrect.

For details about why the request was forbidden, see the Apache error log at:

/srv/users/SYSUSER/log/APPNAME/APPNAME_apache.error.log

I have set the file permissions to 777, and checked that the indax.php file is in the directory.

What can I do to fix this?