Material Components Web failed during yarn watch

Hi,

I just tried to install Material Components Web to use them in my VueComponents. After I installed the package material-components-web via yarn, I added an import directive to my scss styles. Then, the following Error is thrown by yarn:

ERROR  Failed to compile with 1 errors                            11:03:47 PM

 error  in ./node_modules/@material/top-app-bar/mdc-top-app-bar.scss

Module build failed: Unknown word (1:1)

> 1 | //
    | ^
  2 | // Copyright 2018 Google Inc. All Rights Reserved.
  3 | //
  4 | // Licensed under the Apache License, Version 2.0 (the "License");


 @ ./node_modules/css-loader?sourceMap!./node_modules/vue-loader/lib/style-compiler?{"vue":true,"id":"data-v-f077ff84","scoped":false,"hasInlineConfig":true}!./node_modules/vue-loader/lib/selector.js?type=styles&index=0!./resources/assets/js/components/ProduktList.vue 3:10-120
 @ ./node_modules/vue-style-loader!./node_modules/css-loader?sourceMap!./node_modules/vue-loader/lib/style-compiler?{"vue":true,"id":"data-v-f077ff84","scoped":false,"hasInlineConfig":true}!./node_modules/vue-loader/lib/selector.js?type=styles&index=0!./resources/assets/js/components/ProduktList.vue
 @ ./resources/assets/js/components/ProduktList.vue
 @ ./resources/assets/js/app.js
 @ multi ./resources/assets/js/app.js ./resources/assets/sass/style.scss

                                              Asset     Size  Chunks                    Chunk Names
fonts/mathilde.otf?aaa05871daf325d1926b0dbd6058e7bb  37.6 kB          [emitted]
                                         /js/app.js  6.94 MB       0  [emitted]  [big]  /js/app
                                     /css/style.css  75.9 kB    0, 0  [emitted]         /js/app, /js/app

ERROR in ./node_modules/css-loader?sourceMap!./node_modules/@material/top-app-bar/mdc-top-app-bar.scss
Module build failed: Unknown word (1:1)

> 1 | //
    | ^
  2 | // Copyright 2018 Google Inc. All Rights Reserved.
  3 | //
  4 | // Licensed under the Apache License, Version 2.0 (the "License");

 @ ./node_modules/css-loader?sourceMap!./node_modules/vue-loader/lib/style-compiler?{"vue":true,"id":"data-v-f077ff84","scoped":false,"hasInlineConfig":true}!./node_modules/vue-loader/lib/selector.js?type=styles&index=0!./resources/assets/js/components/ProduktList.vue 3:10-120
 @ ./node_modules/vue-style-loader!./node_modules/css-loader?sourceMap!./node_modules/vue-loader/lib/style-compiler?{"vue":true,"id":"data-v-f077ff84","scoped":false,"hasInlineConfig":true}!./node_modules/vue-loader/lib/selector.js?type=styles&index=0!./resources/assets/js/components/ProduktList.vue
 @ ./resources/assets/js/components/ProduktList.vue
 @ ./resources/assets/js/app.js
 @ multi ./resources/assets/js/app.js ./resources/assets/sass/style.scss