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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/25/d13374909/htdocs/freilichtbuehne-mh/wp-content/plugins/jetpack/class.jetpack-sync.php:38 Stack trace: #0 /homepages/25/d13374909/htdocs/freilichtbuehne-mh/wp-content/plugins/jetpack/modules/enhanced-distribution.php(12): Jetpack_Sync::sync_posts('/homepages/25/d...') #1 /homepages/25/d13374909/htdocs/freilichtbuehne-mh/wp-content/plugins/jetpack/class.jetpack.php(750): require('/homepages/25/d...') #2 /homepages/25/d13374909/htdocs/freilichtbuehne-mh/wp-includes/plugin.php(505): Jetpack::load_modules('') #3 /homepages/25/d13374909/htdocs/freilichtbuehne-mh/wp-settings.php(237): do_action('plugins_loaded') #4 /homepages/25/d13374909/htdocs/freilichtbuehne-mh/wp-config.php(88): require_once('/homepages/25/d...') #5 /homepages/25/d13374909/htdocs/freilichtbuehne-mh/wp-load.php(29): require_once('/homepages/25/d...') #6 /homepages/25/d13374909/htdocs/freilichtbuehne-mh/wp-blog-header.php(12): require_once('/homepages/25/d...') #7 /homepages/25/d13374909/htdocs/freilichtbuehne-mh/index.php(17): require('/homepages/25/d...') #8 {main} thrown in /homepages/25/d13374909/htdocs/freilichtbuehne-mh/wp-content/plugins/jetpack/class.jetpack-sync.php on line 38