undefined method WidgetCache

Hi Tom,

Thanks for your wonderful plugin.

My site is http://www.huntsimply.com/. I received this error when I tried to add any widget to the menu:
Fatal error: Call to undefined method WidgetCache::get_settings() in /home/huntsimp/public_html/wp-content/plugins/megamenu/classes/widget-manager.class.php on line 320

Would you be able to advice me?

I have disabled the plugin from the site for now as nothing (other than the fatal error message and the logo) will be shown if it is activated.

Thanks in advance.

Regards
hunt

https://wordpress.org/plugins/megamenu/