How to fix WordPress non-existent changeset UUID ?
It can happen sometimes that 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
- Save your changes
That's it, the error message should have gone now.