ERROUUUU.md

yarn start v0.24.4
$ ng serve 
** NG Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200 **
Hash: 2e4faa3c53819ee36039                                                              
Time: 28619ms
chunk    {0} polyfills.bundle.js, polyfills.bundle.js.map (polyfills) 158 kB {4} [initial] [rendered]
chunk    {1} styles.bundle.js, styles.bundle.js.map (styles) 189 kB {4} [initial] [rendered]
chunk    {2} main.bundle.js, main.bundle.js.map (main) 7.45 kB {3} [initial] [rendered]
chunk    {3} vendor.bundle.js, vendor.bundle.js.map (vendor) 2.46 MB [initial] [rendered]
chunk    {4} inline.bundle.js, inline.bundle.js.map (inline) 0 bytes [entry] [rendered]

ERROR in ./~/css-loader?{"sourceMap":false,"importLoaders":1}!./~/postcss-loader?{"ident":"postcss"}!./~/sass-loader/lib/loader.js?{"sourceMap":false,"precision":8,"includePaths":[]}!./src/assets/scss/application.scss
Module build failed: 
  @include badge-variant($white);
          ^
      No mixin named badge-variant

Backtrace:
	src/assets/scss/_utils.scss:22
      in /home/samuel/Documentos/Dev/Teste/sing-angular-cli/src/assets/scss/_utils.scss (line 22, column 12)
 @ ./src/assets/scss/application.scss 4:14-212
 @ multi ./~/font-awesome/scss/font-awesome.scss ./~/bootstrap/scss/bootstrap.scss ./src/assets/scss/application.scss ./src/styles.scss
webpack: Failed to compile.