How to fix Failed to compile error?

Question

JavaScript

Laravel 5.4, mix, css-loader
Problem with jquery.filer package due to nested css imports
The command throws an npm run deverror:

ERROR  Failed to compile with 4 errors                                                                                                  
This dependency was not found:

    * -!../../../node_modules/css-loader/index.js?{"url":true,"sourceMap":false}!../assets/fonts/jquery.filer-icons/jquery-filer.css in ./~/css-loader?{"url":true,"sourceMap":false}!./~/postcss-loader?{"sourceMap":false}!./~/resolve-url-loader!./~/sass-loader/lib/loader.js?{"precision":8,"outputStyle":"expanded","sourceMap":true}!./resources/assets/sass/app.scss

    To install it, you can run: npm install --save -!../../../node_modules/css-loader/index.js?{"url":true,"sourceMap":false}!../assets/fonts/jquery.filer-icons/jquery-filer.css

In app.scss I import the main jquery.filer.css

@import "node_modules/jquery.filer/css/jquery.filer";

In jquery.filer.css there is a css connection with fonts, which gives an error

@import url('../assets/fonts/jquery.filer-icons/jquery-filer.css');

There needs to be some other way to register, or what? But what?