Fatal error: Uncaught Error: Call to a member function enqueue_frontend_resources() on null in /wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php:150 Stack trace: #0 /wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php(136): Imagely\NGG\Display\DisplayManager::enqueue_frontend_resources_for_displayed_gallery(Object(Imagely\NGG\DataTypes\DisplayedGallery), NULL) #1 /wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php(153): Imagely\NGG\Display\DisplayManager::enqueue_frontend_resources_for_alternate_displayed_gallery(Object(Imagely\NGG\DataTypes\DisplayedGallery), Object(Imagely\NGG\DisplayTypes\Thumbnails)) #2 /wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php(112): Imagely\NGG\Display\DisplayManager::enqueue_frontend_resources_for_displayed_gallery(Object(Imagely\NGG\DataTypes\DisplayedGallery), Object(Imagely\NGG\DisplayTypes\Thumbnails)) #3 /wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php(53): Imagely\NGG\Display\DisplayManager::enqueue_fronte in /wp-content/plugins/nextgen-gallery/src/Display/DisplayManager.php on line 150