title: cannot import MatDialogModule in app.module
body: <p>I am a beginner in angular,
  I am using angular material dialog box. first I added material to my project and use it from <code>@angular/material</code>.</p>
  
  <p>When I add ( <code>import { MatDialogModule } from '@angular/material/dialog';</code> )) in <code>app.module.ts</code>, get below error on compiling project</p>
  
  <pre><code> ERROR in node_modules/@angular/cdk/coercion/array.d.ts(10,60): error
   TS1005: ',' expected.
   node_modules/@angular/cdk/coercion/array.d.ts(10,61): error TS1005:
   ',' expected. node_modules/@angular/cdk/coercion/array.d.ts(10,75):
   error TS1144: '{' or ';' expected.
   node_modules/@angular/cdk/coercion/array.d.ts(10,77): error TS1011: An
   element access expression should take an argument.
  </code></pre>
  
  <p>why?</p>
  
  <p>this is my package.json:</p>
  
  <pre><code>      {
        "name": "sales-maret",
        "version": "0.0.0",
        "scripts": {
          "ng": "ng",
          "start": "ng serve",
          "build": "ng build",
          "test": "ng test",
          "lint": "ng lint",
          "e2e": "ng e2e"
        },
        "private": true,
        "dependencies": {
          "@angular/animations": "^7.2.16",
          "@angular/cdk": "^9.2.0",
          "@angular/common": "~7.2.0",
          "@angular/compiler": "~7.2.0",
          "@angular/core": "~7.2.0",
          "@angular/forms": "~7.2.0",
          "@angular/material": "^9.2.0",
          "@angular/platform-browser": "~7.2.0",
          "@angular/platform-browser-dynamic": "~7.2.0",
          "@angular/router": "~7.2.0",
          "core-js": "^2.5.4",
          "hammerjs": "^2.0.8",
          "material-icons": "^0.3.1",
          "rxjs": "~6.3.3",
          "tslib": "^1.9.0",
          "zone.js": "~0.8.26"
        },
        "devDependencies": {
          "@angular-devkit/build-angular": "~0.13.0",
          "@angular/cli": "~7.3.6",
          "@angular/compiler-cli": "~7.2.0",
          "@angular/language-service": "~7.2.0",
          "@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": "~4.0.0",
          "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": "~3.2.2"
        }
      }
  </code></pre>