Hey @dragonred7 ,
Thanks for reaching out to us. I checked your page and I see the content on your site is being served by the cache. After doing the updates, always remember to clear all caches. When updating so that the code from the latest release is always in use. This will help you to avoid any potential errors. Also I see a notice X is running without Cornerstone, before the error is being triggered (see screenshot)
Make sure the Cornerstone plugin is properly installed and activated. You can also check for the following first:
Ensure everything is up to date according to our version compatibility list at https://theme.co/apex/forum/t/troubleshooting-version-compatibility/195. Please follow the best practices when updating your theme and plugins. See https://theme.co/apex/forum/t/setup-updating-your-themes-and-plugins/62 for more details.
Clear all caches including browser cache then deactivate your caching plugin and other optimization plugins.
If you're using a CDN, please clear the CDN's cache and disable optimization services.
Test for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it's fixed, you'll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.
If you still have problems kindly get back to us with the result of the steps above and URL/User/Pass of your WordPress dashboard using the Secure Note functionality of the post to follow up the case.