Fatal Error in my website

My website is showing this error: Fatal error: Uncaught Error: Call to undefined function wp() in /home/ilneooly2lej/public_html/shibaswife.com/wp-blog-header.php:16 Stack trace: #0 /home/ilneooly2lej/public_html/shibaswife.com/index.php(17): require() #1 {main} thrown in /home/ilneooly2lej/public_html/shibaswife.com/wp-blog-header.php on line 16

The website doesn’t even allow me to access my admin dashboard. Please help if someone has had the same issue.

• This topic was modified 2 years, 7 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Everything else WordPress topic

The page I need help with: [log in to see the link]