When I first tried installing it, I uploaded files to my server, on a subdomain of an add on domain, I entered to site and I saw the install page but nothing happened when i clicked on “create a config page” link. I searched for a solution and found that this resourced from the wordpress installed on the main directory.

I renamed the wp-config.php to something else and tried again. It was ok, I could install wordpress mu. But whats that? When I tried to login, I got this error: “Warning! VHOST must be ‘yes’ or ‘no’ in wp-config.php” I checked the wp-config.php and saw that it VHOST was set to Yes, but it was giving the same error.

I talked this to good guys from hostgator. And we realized that It was resourced from the uppercase y in “Yes”. It must be written with lowercase letters.

It is ok now. I am trying wordpress mu on my shared hosting from hostgator.