Expected Digit error when using sass dart variables

I got the following error when trying to use variables syntax in my sass file:

```
@use "../variables" as v;

@mixin size() {
&.small {
font-size: var(--font-size-small);
width: 45px;
height: 45px;
border: 3px solid v.color("primary");
}
```

**Error: Expected digit.**
src\components\avatar\avatar.module.scss 8:25 root stylesheet
at Object.j2 (E:\git\Butterscotch\node_modules\rollup-plugin-sass\node_modules\sass\sass.dart.js:12389:32)
at Object.np (E:\git\Butterscotch\node_modules\rollup-plugin-sass\node_modules\sass\sass.dart.js:12305:39)
at D4.dart.D4.$2 (E:\git\Butterscotch\node_modules\rollup-plugin-sass\node_modules\sass\sass.dart.js:12406:21)
at Ay.va (E:\git\Butterscotch\node_modules\rollup-plugin-sass\node_modules\sass\sass.dart.js:3977:42)
at m7.uf (E:\git\Butterscotch\node_modules\rollup-plugin-sass\node_modules\sass\sass.dart.js:3095:46)
at A2.$0 (E:\git\Butterscotch\node_modules\rollup-plugin-sass\node_modules\sass\sass.dart.js:3309:7)
at Object.dr (E:\git\Butterscotch\node_modules\rollup-plugin-sass\node_modules\sass\sass.dart.js:3236:80)
at a7.dart.a7.be (E:\git\Butterscotch\node_modules\rollup-plugin-sass\node_modules\sass\sass.dart.js:3162:3)