Fatal error: Uncaught Error: Call to undefined function get_field() in /customers/9/3/4/rebelleader.de/httpd.www/wp-content/themes/rebelleaber/header.php:30
Stack trace:
#0 /customers/9/3/4/rebelleader.de/httpd.www/wp-includes/template.php(810): require_once()
#1 /customers/9/3/4/rebelleader.de/httpd.www/wp-includes/template.php(745): load_template('/customers/9/3/...', true, Array)
#2 /customers/9/3/4/rebelleader.de/httpd.www/wp-includes/general-template.php(48): locate_template(Array, true, true, Array)
#3 /customers/9/3/4/rebelleader.de/httpd.www/wp-content/themes/rebelleaber/single.php(8): get_header()
#4 /customers/9/3/4/rebelleader.de/httpd.www/wp-includes/template-loader.php(106): include('/customers/9/3/...')
#5 /customers/9/3/4/rebelleader.de/httpd.www/wp-blog-header.php(19): require_once('/customers/9/3/...')
#6 /customers/9/3/4/rebelleader.de/httpd.www/index.php(17): require('/customers/9/3/...')
#7 {main}
  thrown in /customers/9/3/4/rebelleader.de/httpd.www/wp-content/themes/rebelleaber/header.php on line 30