Elementor Fatal error: Class ‘Elementor\Widget_Base’ not found
I had the same problem. Take $this->includes(); out of the init method, and put it into the register_widgets method: public function init() { … // Include plugin files // $this->includes(); // <– remove this } public function register_widgets() { $this->includes(); // <- put it here \Elementor\Plugin::instance()->widgets_manager->register_widget_type( new \Elementor_oEmbed_Widget() ); }