- Try downloading the latest version of my plugin
- Try deleting the uicustom folder from your game's directory. The error indicates that it cannot read the profile (config.json) that stores your customization, because the file is corrupted.
Viewing post in [RPG Maker] WYSIWYG UI Editor - Main Menu comments
I think http://www.yanfly.moe/wiki/Options_Core_VisuStella_MZ is a nice candidate