Blocking selectors

When selecting classes with Oxywind I am getting these crashes, it does not allow me to add classes in a lower div.

Oxywind

Oxywind does not work

I have Oxygen 4.0 version, when I install the plugin the CSS selectors are not saved, and the blue Tailwind icon does not appear after the Tailwind selectors box.   I don’t know if the error could be due to the image attachment 3 about angular.js error.

Oxywind