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