Mobil navigation broken after plugin upgrade

Website: Doindishes.com
Upgraded a few plugins about a week ago and the navigation button (hamburger) stopped working on the phone.

On the dashboard I tried to activate Cornerstone plugin and I got the following: Fatal error : Cannot declare class Cornerstone_Plugin_Base, because the name is already in use in /home3/doindish/public_html/wp-content/plugins/cornerstone/includes/utility/plugin-base.php on line 6

Please advise.
Thank you.

Hello Elena,

It looks like you are using Pro on your site. Since you are using Pro, please disable and delete Cornerstone in the plugins area since it will cause an issue on the site if you have Cornerstone activated separately as if already comes native to Pro.

Hope this helps.

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