The Simple Site map is not working for me properly

i have installed the simple site map plugin to generate site maps for my site(s), and i keep getting an error

it is telling me that fatal error with this at the bottom

Simple Sitemaps file "sitemap.php" not found. Please move it to /wp-content/ before activating.

i have done what it asks and it still wont activate this plugin, can you help me with this

i have also added the line to the http access to