Fatal error: Uncaught Error: Call to undefined function add_action() in C:\xampp\htdocs\labslibjkt\wp-content\plugins\jetpack\modules\subscriptions\newsletter-widget\class-jetpack-newsletter-dashboard-widget.php:236 Stack trace: #0 {main} thrown in C:\xampp\htdocs\labslibjkt\wp-content\plugins\jetpack\modules\subscriptions\newsletter-widget\class-jetpack-newsletter-dashboard-widget.php on line 236