Fatal error: Uncaught TypeError: call_user_func_array(): Argument #1 ($callback) must be a valid callback, first array member is not a valid class name or object in /customers/0/0/e/wormwinther.no/httpd.www/wp-content/plugins/jetpack/class.jetpack-sync.php:39
Stack trace:
#0 /customers/0/0/e/wormwinther.no/httpd.www/wp-content/plugins/jetpack/modules/enhanced-distribution.php(12): Jetpack_Sync::sync_posts('/customers/0/0/...')
#1 /customers/0/0/e/wormwinther.no/httpd.www/wp-content/plugins/jetpack/class.jetpack.php(924): require('/customers/0/0/...')
#2 /customers/0/0/e/wormwinther.no/httpd.www/wp-includes/class-wp-hook.php(307): Jetpack::load_modules('')
#3 /customers/0/0/e/wormwinther.no/httpd.www/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#4 /customers/0/0/e/wormwinther.no/httpd.www/wp-includes/plugin.php(474): WP_Hook->do_action(Array)
#5 /customers/0/0/e/wormwinther.no/httpd.www/wp-settings.php(450): do_action('plugins_loaded')
#6 /customers/0/0/e/wormwinther.no/httpd.www/wp-config.php(96): require_once('/customers/0/0/...')
#7 /customers/0/0/e/wormwinther.no/httpd.www/wp-load.php(50): require_once('/customers/0/0/...')
#8 /customers/0/0/e/wormwinther.no/httpd.www/wp-blog-header.php(13): require_once('/customers/0/0/...')
#9 /customers/0/0/e/wormwinther.no/httpd.www/index.php(17): require('/customers/0/0/...')
#10 {main}
  thrown in /customers/0/0/e/wormwinther.no/httpd.www/wp-content/plugins/jetpack/class.jetpack-sync.php on line 39