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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 /homepages/7/d294384601/htdocs/wp-content/plugins/jetpack/class.jetpack-sync.php:39 Stack trace: #0 /homepages/7/d294384601/htdocs/wp-content/plugins/jetpack/modules/enhanced-distribution.php(12): Jetpack_Sync::sync_posts('/homepages/7/d2...') #1 /homepages/7/d294384601/htdocs/wp-content/plugins/jetpack/class.jetpack.php(924): require('/homepages/7/d2...') #2 /homepages/7/d294384601/htdocs/wp-includes/plugin.php(496): Jetpack::load_modules('') #3 /homepages/7/d294384601/htdocs/wp-settings.php(237): do_action('plugins_loaded') #4 /homepages/7/d294384601/htdocs/wp-config.php(88): require_once('/homepages/7/d2...') #5 /homepages/7/d294384601/htdocs/wp-load.php(29): require_once('/homepages/7/d2...') #6 /homepages/7/d294384601/htdocs/wp-blog-header.php(12): require_once('/homepages/7/d2...') #7 /homepages/7/d294384601/htdocs/index.php(17): require('/homepages/7/d2...') #8 {main} thrown in /homepages/7/d294384601/htdocs/wp-content/plugins/jetpack/class.jetpack-sync.php on line 39