Can't configure Membership Pro

Hello, I don't know what I could be doing wrong. I just installed membership pro and every time I try to save the configuration page, I get a message like this:

Forbidden

You don't have permission to access /administrator/index.php on this server.

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

What do I do?
Joomla version is 2.5.20

Thanks for your help.

Hi Vicky

From what I see, it seems the server where your site is stored has a security add-on which causes this error (infact, it blocks this request from the component, might because the configuration page has many input -options).

Could you please help me contact your hosting provider ask them to check it first ? They should be able to figure out what causes the error and help us change it. This is nothing wrong with the code, I am sure !

Tuan

BTW, you can try to empty the value of Invoice Layout config option and the configuration page should be saved properly. !

Tuan