add new article displays an error message

Hi there, when I clik on add new article. I now get an error message that says "Not Acceptable

An appropriate representation of the requested resource /~uigvtyaz/administrator/index.php could not be found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request."

or if it does load, the text editor box is blank, and if I go back or reload that page I will also get teh above error message.

Hello,

If you are accessing the joomla site with something like:

77.77.77.77/~someusername/

then it will not work, you need to have a domain name like:

www.someusername.com

OR have you joomla installation in a subfolder like:

www.someusername.com/subfolder/