whebever i use the administrative panel and try to save the changes this error comes:

An appropriate representation of the requested resource /administrator/index2.php could not be found on this server.

Can someone help me please.

Same kind of problem here:
whenever i try to uodate or edit a profiile in any way, a 406 shows up.
tried to modify the htaccess file..no results...
Anybody any idea?

Thanks!!!!