Fatal error: Uncaught Error: Call to undefined method Automattic\Jetpack\Heartbeat::get_active_plugins() in /customers/6/4/6/fyrspillene.dk/httpd.www/wp-content/plugins/jetpack/class.jetpack.php:2033
Stack trace:
#0 /customers/6/4/6/fyrspillene.dk/httpd.www/wp-content/plugins/jetpack/class.jetpack.php(2154): Jetpack::get_active_plugins()
#1 /customers/6/4/6/fyrspillene.dk/httpd.www/wp-includes/class-wp-hook.php(341): Jetpack->check_twitter_tags('')
#2 /customers/6/4/6/fyrspillene.dk/httpd.www/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array)
#3 /customers/6/4/6/fyrspillene.dk/httpd.www/wp-includes/plugin.php(522): WP_Hook->do_action(Array)
#4 /customers/6/4/6/fyrspillene.dk/httpd.www/wp-settings.php(622): do_action('plugins_loaded')
#5 /customers/6/4/6/fyrspillene.dk/httpd.www/wp-config.php(103): require_once('/customers/6/4/...')
#6 /customers/6/4/6/fyrspillene.dk/httpd.www/wp-load.php(50): require_once('/customers/6/4/...')
#7 /customers/6/4/6/fyrspillene.dk/httpd.www/wp-blog-header.php(13): require_once('/customers/6/4/...')
#8 /customers/6/4/6/fyrspillene.dk/httpd.www/index.php(17): require('/customers/6/4/...')
#9 {main}
  thrown in /customers/6/4/6/fyrspillene.dk/httpd.www/wp-content/plugins/jetpack/class.jetpack.php on line 2033