getting undefined messages

It looks like the plugin doesn’t import all .scss files, so it won’t recognise linked variables and mixins. This is what I have:

@import “bootstrap”;
@import “fonts”;
@import “variables”;
@import “mixins”;
@import “base”;
@import “form-elements”;
@import “main-navigation”;
@import “print”;

I have updated to WP 6.1.1. No clue why it doesn’t work. Can you help please?