Messages

Recently i installed the software. I opened the page and everything was ok, but the second time that i opened, the page give me this message:

Not Acceptable
An appropriate representation of the requested resource / could not be found on this server.
Additionally, a 406 Not Acceptable error was encountered while trying to use an ErrorDocument to handle the request.

What can i do? I need to install your software. I like so much.

Thank you for yout help.

Regards.