I think the errors are due to the fact that a new version has already been released, fixing the errors
v23.0.1 Untouched
@NullMaster @Tomz
Version 23.0.1 – May 26, 2021
* Added: Muffin Builder - Option to disable hover effects
For those who prefer our previous version of the builder we’ve added an option to display item bars fixed
[ Muffin Builder > Settings > Hover effects ]
* Added: Muffin Builder - Simple view - Item labels
For those who prefer our previous version of the builder we’ve added item labels in Simple view
[ Muffin Builder > Settings > Simple view ]
* Added: Option to disable built-in HTML5 video player and use native browser player
[ Theme Options > Global > Advanced > Theme functions > HTML5 player ]
* Added: Logo - Attachment data - Width & Height
* Fixed: Muffin Builder - Back to top button restored
* Fixed: Muffin Builder - Item preview - Image max-width
* Fixed: Muffin Builder + Classic Editor plugin - Full-height editor - Unwanted scroll to top
* Fixed: Image and Video items - HTML resize - Width and height attribute
* Improved: Preformance - CSS files combined and minified
Please update the entire theme folder and empty cache