Google XML Sitemap SEO - Internal Server Error

[juggy 0]

Hi, i have installed the Google XML Sitemap SEO, but i am getting and internal server error when i attempt to run the page;

 

http://YOUR_DOMAIN/dev/googlesitemap/index.php'>http://YOUR_DOMAIN/dev/googlesitemap/index.php

 

The catalog is located in http://YOUR_DOMAIN/dev

 

i have changed to alternate class and checked diagnostic output but still keep getting the same error, all the files/folder permissions are set correctly to 777.

 

I also have Header Tags SEO and Ultimate SEO URLS installed which all work fine, please advise.

 

many thanks in advance

 

Juggy