I keep getting no mixin neamed nb-install global when I try using nebular in another project

I've been trying to use the login page from nebular in my project but after adding:

@import '~@nebular/theme/styles/globals';
@import '~@nebular/bootstrap/styles/globals';

// install the framework and custom global styles
@include nb-install() {

// framework global styles
@include nb-theme-global();
@include nb-bootstrap-global();
};

to my styles.scss since the login pages looked [weird](https://i.stack.imgur.com/IPy8v.png) I started getting the no mixin named nb-install-global when running ng serve