I have received this message from WordPress. The conflict is with Cornerstone.
Hello!
Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site and alerts you via this automated email.
In this case, WordPress has detected an error with one of your plugins, Cornerstone.
First, visit your website ( https://www.liohproducts.com/ ) and check if there are any visible problems. Next, visit the page where the error was detected ( https://www.liohproducts.com/wp-admin/admin-ajax.php ) and check if there are any visible problems.
Please contact your property for assistance in further investigating this issue.
If your site seems broken and you cannot access your desktop normally, WordPress now has a special “recovery mode”. This allows you to safely access your desktop and investigate further.
https://www.liohproducts.com/wp-login.php?action=enter_recovery_mode&rm_token=Qgo7XwBUs9sotyoEfcFjqg&rm_key=Ngdo8OJ0PEXQbxlzMSMFVA
To keep your site safe, this link will expire in 1 day. However, don’t worry about this: you will receive a new link by email if the error occurs again after it expires.
When looking for help with this problem, you may be asked for the following information:
WordPress version 5.7.1
Current theme: X - Child Theme (version 1.0.0)
Current plugin: Cornerstone (version 5.3.3)
PHP version 7.4.16
Details of the error
An E_ERROR error occurred on line 62 of the file / srv / vhost / liohproducts.com/home/html/wp-content/plugins/cornerstone/includes/extend/portfolio.php . Error message: Uncaught Error: Call to undefined function x_get_option () in / srv / vhost / liohproducts.com/home/html/wp-content/plugins/cornerstone/includes/extend/portfolio.php:62
Stack trace:
7 {main}
thrown