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Undefined Function Help

I use some help. My site is experiencing a fatal error and I can't seems to get it fixed.

I am getting the following message; 

Fatal error: Call to undefined function wp() in /home/content/56/8825156/html/wp-blog-header.php on line 16

 

I have done a bunch of research into this and have disabled my plugins by re-naming them, I have replaced all the files except for wp-content, and tried just about ever other suggestion out there and still can't fix it. Can someone please help me out here and steer me in the right direction.Thanks.