site inaccessible after manually extending pro site status

Hi guys

I´ve just create a website in my multisite installation, I was able to access it with its´s own administration user (different than admin) then I went to the super admin dashboard (in a different session) and manually extended the pro sites status. But now either with the site admin or the super admin the website is inaccessible and it´s dashboard as well.

this definitely happened after extending the pro site status.

this is the message I´m getting

Fatal error: Call to a member function flush_rules() on a non-object in /home/webstud1/public_html/wp-includes/rewrite.php on line 108

thanks