Fatal error: Uncaught Error: Call to undefined function dt_retina_on() in /homepages/21/d443904305/htdocs/wp-content/themes/dt-the7-Theme/header.php:36
Stack trace:
#0 /homepages/21/d443904305/htdocs/wp-includes/template.php(730): require_once()
#1 /homepages/21/d443904305/htdocs/wp-includes/template.php(676): load_template('/homepages/21/d...', true, Array)
#2 /homepages/21/d443904305/htdocs/wp-includes/general-template.php(48): locate_template(Array, true, true, Array)
#3 /homepages/21/d443904305/htdocs/wp-content/themes/dt-the7-Theme/archive.php(23): get_header()
#4 /homepages/21/d443904305/htdocs/wp-includes/template-loader.php(106): include('/homepages/21/d...')
#5 /homepages/21/d443904305/htdocs/wp-blog-header.php(19): require_once('/homepages/21/d...')
#6 /homepages/21/d443904305/htdocs/index.php(17): require('/homepages/21/d...')
#7 {main}
thrown in /homepages/21/d443904305/htdocs/wp-content/themes/dt-the7-Theme/header.php on line 36