Can't use Flex in new Angular-8 application

Question

When I use Flex in my new Angular 8 app, I face this Error message.

ERROR

Error: StaticInjectorError(AppModule)[DefaultLayoutDirective -> StyleUtils]: StaticInjectorError(Platform: core)[DefaultLayoutDirective -> StyleUtils]: NullInjectorError: No provider for StyleUtils!

Package.json:

{
  "name": "angular",
  "version": "0.0.0",
  "private": true,
  "dependencies": {
    "@angular/cdk": "^9.0.0-rc.8",
    "@angular/common": "8.0.0",
    "@angular/compiler": "8.0.0",
    "@angular/core": "8.0.0",
    "@angular/flex-layout": "^9.0.0-beta.28",
    "@angular/forms": "8.0.0",
    "@angular/platform-browser": "8.0.0",
    "@angular/platform-browser-dynamic": "8.0.0",
    "@angular/router": "8.0.0",
    "core-js": "2.6.9",
    "rxjs": "6.5.2",
    "tslib": "^1.9.0",
    "zone.js": "0.9.1"
  },
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.10.0",
    "@angular/cli": "~7.0.2",
    "@angular/compiler-cli": "~7.0.0",
    "@angular/language-service": "~7.0.0",
    "@types/node": "~8.9.4",
    "@types/jasmine": "~2.8.8",
    "@types/jasminewd2": "~2.0.3",
    "codelyzer": "~4.5.0",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~3.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~1.1.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.11.0",
    "typescript": "~3.1.1"
  }
}

Answer 1

Change this line of dependency in your package.json:

"@angular/flex-layout": "8.0.0",

and import this module into your app.module.ts:

@NgModule({
  declarations: [
    AppComponent
  ],
  exports: [
    AppComponent
  ],
  imports: [
    ...
    FlexLayoutModule
  ],
})

The most recent iteration of the package could be buggy, therefore I would recommend to use an older stable version instead of the beta version. It should also reflect the version number of the other @angular packages to ensure compatibility.