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/c/d/2/horbyblasorkester.se/httpd.www/wp-content/plugins/jetpack/class.jetpack-sync.php:62
Stack trace:
#0 /customers/c/d/2/horbyblasorkester.se/httpd.www/wp-content/plugins/jetpack/jetpack.php(66): Jetpack_Sync::sync_options('/customers/c/d/...', 'widget_twitter')
#1 /customers/c/d/2/horbyblasorkester.se/httpd.www/wp-settings.php(305): include_once('/customers/c/d/...')
#2 /customers/c/d/2/horbyblasorkester.se/httpd.www/wp-config.php(90): require_once('/customers/c/d/...')
#3 /customers/c/d/2/horbyblasorkester.se/httpd.www/wp-load.php(37): require_once('/customers/c/d/...')
#4 /customers/c/d/2/horbyblasorkester.se/httpd.www/wp-blog-header.php(13): require_once('/customers/c/d/...')
#5 /customers/c/d/2/horbyblasorkester.se/httpd.www/index.php(17): require('/customers/c/d/...')
#6 {main}
  thrown in /customers/c/d/2/horbyblasorkester.se/httpd.www/wp-content/plugins/jetpack/class.jetpack-sync.php on line 62