WordPress is one of the best CMS in this world for startup to enterprises but due to some security facts, sometime we face some common issues. It can happen sometimes when you are trying to customize your website from the WordPress live customizer, and you get the following error message in the preview frame : “Non-existent changeset UUID“.
This problem usually occurs when there’s a mismatch between your actual website URL and the one saved in your WordPress general settings.
To fix this problem :
- Connect to your WordPress admin
- Navigate to Settings > General in the left panel
- Make sure your WordPress Address and your Site Address are exactly the same like if you have used https or http so both should be in https or http.
- Save your changes
That’s it, in most of the cases, the error message should have gone now.
If you are still getting the error message, your might want to visit the following forum topic on WP.org
Or you may visit this Link :