Same here. I’m getting a similar error. This is the explanation from shiel security: “

You’re getting this error because there’s a plugin on your site using an older version of the PHP carbon library.

We discussed this error here:
https://wordpress.org/support/topic/possible-conflict-with-simply-schedule-appointments-plugin/

The Carbon library that we’re using in Shield is fairly widely used and is likely used within another plugins. The version of the other plugin on your site is likely version 1.0 (deprecated and fairly old) and it’s conflicting with the version of Carbon within Shield (v2).

We’ve switched to PHP 7.2 minimum and also with a view to support PHP 8.2+… this required us to upgrade several of our PHP libraries, one of which was Carbon (the other was Monolog).

After numerous releases, we’ve made a significant change in how we load the Monolog library to prevent fatal errors, but this does mean that any sites with conflicting Monlog libraries will not be able to use Shield’s Activity Log or Traffic Log features. It was this, or allow sites to go offline with fatal errors.

This same change we made with Monolog can’t be applied to Carbon as it’s too deeply integrated into Shield. This means that if you have a site throwing errors relating to Carbon, then you can either:

1) Find and disable/replace the plugin with the conflicting Carbon library.

2) Disable Shield until an alternative plugin can be found to replace the conflict. Contact the dev of the plugin and ask them if they’d consider moving to Carbon v2.

3) Revert Shield to the 16.1.15 version
But again, you’ll need to push the conflicting plugin devs to update their PHP carbon library. Once they do that, you can upgrade Shield to the latest version normally.”

I really hope that hurry timer will update this plugin, i REALLY want to buy it but i’m afraid that this error continue