Fatal error: Uncaught Error: Call to a member function hook() on null in /home/rockang6/public_html/web/wp-content/themes/Linco/header.php:8 Stack trace: #0 /home/rockang6/public_html/web/wp-includes/template.php(704): require_once() #1 /home/rockang6/public_html/web/wp-includes/template.php(653): load_template('/home/rockang6/...', true) #2 /home/rockang6/public_html/web/wp-includes/general-template.php(41): locate_template(Array, true) #3 /home/rockang6/public_html/web/wp-content/themes/Linco/single.php(1): get_header() #4 /home/rockang6/public_html/web/wp-includes/template-loader.php(77): include('/home/rockang6/...') #5 /home/rockang6/public_html/web/wp-blog-header.php(19): require_once('/home/rockang6/...') #6 /home/rockang6/public_html/index.php(17): require('/home/rockang6/...') #7 {main} thrown in /home/rockang6/public_html/web/wp-content/themes/Linco/header.php on line 8