Taking fatal error after activating plugins in Primary Site

Greetings,

I just activated a number of plugins in my primary site for a multisite network. It took this error, "Fatal error: Call to a member function get() on a non-object in /home/janua/public_html/wp-includes/query.php on line 27", and now I am unable to log into the network. I have no debugging skills for WP/PHP. Can you give me some direction on how to go about solving this issue?

thanks