Fatal error: Uncaught Error: Call to undefined function twentytwentyone_the_html_classes() in /home/stgx7299/public_html/wp-content/themes/twentytwentyone/header.php:16 Stack trace: #0 /home/stgx7299/public_html/wp-includes/template.php(814): require_once() #1 /home/stgx7299/public_html/wp-includes/template.php(749): load_template('/home/stgx7299/...', true, Array) #2 /home/stgx7299/public_html/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #3 /home/stgx7299/public_html/wp-content/themes/twentytwentyone/page.php(12): get_header() #4 /home/stgx7299/public_html/wp-includes/template-loader.php(125): include('/home/stgx7299/...') #5 /home/stgx7299/public_html/wp-blog-header.php(19): require_once('/home/stgx7299/...') #6 /home/stgx7299/public_html/index.php(17): require('/home/stgx7299/...') #7 {main} thrown in /home/stgx7299/public_html/wp-content/themes/twentytwentyone/header.php on line 16