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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 /is/htdocs/wp12163729_RHS1NAZ1XG/www/literarischer-herbst-info/wp/wp-content/plugins/jetpack/class.jetpack-sync.php:38 Stack trace: #0 /is/htdocs/wp12163729_RHS1NAZ1XG/www/literarischer-herbst-info/wp/wp-content/plugins/jetpack/modules/enhanced-distribution.php(12): Jetpack_Sync::sync_posts('/is/htdocs/wp12...') #1 /is/htdocs/wp12163729_RHS1NAZ1XG/www/literarischer-herbst-info/wp/wp-content/plugins/jetpack/class.jetpack.php(750): require('/is/htdocs/wp12...') #2 /is/htdocs/wp12163729_RHS1NAZ1XG/www/literarischer-herbst-info/wp/wp-includes/plugin.php(505): Jetpack::load_modules('') #3 /is/htdocs/wp12163729_RHS1NAZ1XG/www/literarischer-herbst-info/wp/wp-settings.php(237): do_action('plugins_loaded') #4 /is/htdocs/wp12163729_RHS1NAZ1XG/www/literarischer-herbst-info/wp/wp-config.php(84): require_once('/is/htdocs/wp12...') #5 /is/htdocs/wp12163729_RHS1NAZ1XG/www/literarischer-herbst-info/wp/wp-load.php(29): require_once('/is/htdocs/wp12...') #6 /is/htdocs/wp12163729_RHS1NAZ1XG/www/literarischer-herbst-info/wp/wp-blog-header.php(12): require_once('/is/htdocs/wp12...') #7 /is/htdocs/wp12163729_RHS1NAZ1XG/www/literarischer-herbst-info/wp/index.php(17): require('/is/htdocs/wp12...') #8 {main} thrown in /is/htdocs/wp12163729_RHS1NAZ1XG/www/literarischer-herbst-info/wp/wp-content/plugins/jetpack/class.jetpack-sync.php on line 38