Failed to load plugin: visualchars from url https://

Hello,

I am recently receiving an error when creating or editing post:

Failed to load plugin: visualchars from url https://domain.com/wp-content/plugins/tinymce-advanced/mce/visualchars/plugin.min.js

I think it happens when Advanced Editor Tools plugin is active.

Could you please help with this.

Thanks