ERROR in ./src/styles/app.scss

[webnegar]

Angular CLI: 9.1.1
Node: 12.16.1
OS: win32 x64

Angular: 9.1.1
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, localize, platform-browser
... platform-browser-dynamic, router
Ivy Workspace: Yes

Package Version

@angular-devkit/architect 0.901.1
@angular-devkit/build-angular 0.901.1
@angular-devkit/build-optimizer 0.901.1
@angular-devkit/build-webpack 0.901.1
@angular-devkit/core 9.1.1
@angular-devkit/schematics 9.1.1
@ngtools/webpack 9.1.1
@schematics/angular 9.1.1
@schematics/update 0.901.1
rxjs 6.5.5
typescript 3.8.3
webpack 4.42.0