title: angular-in-memory-web-api internal server error
body: <p>I have reached the latest step in <a href="https://angular.io/tutorial" rel="nofollow noreferrer">Angular's Tour-of-Heroes tutorial</a>. After using the angular-in-memory-web-api, no data has appeared on my screen. There is no compilation error, but in the browser's console i get this: </p>
  
  <p><a href="https://i.stack.imgur.com/6A1kc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6A1kc.png" alt="image description"></a></p>
  
  <p>Everything is exactly the same as in the  tutorial. I have not yet found any solution to this, hence why I had to ask it myself.</p>
  
  <p>this is how my package.json looks:</p>
  
  <pre><code>{
    "name": "tour-of-heroes",
    "version": "0.0.0",
    "license": "MIT",
    "scripts": {
      "ng": "ng",
      "start": "ng serve",
      "build": "ng build --prod",
      "test": "ng test",
      "lint": "ng lint",
      "e2e": "ng e2e"
    },
    "private": true,
    "dependencies": {
      "@angular/animations": "^5.2.0",
      "@angular/common": "^5.2.0",
      "@angular/compiler": "^5.2.0",
      "@angular/core": "^5.2.0",
      "@angular/forms": "^5.2.0",
      "@angular/http": "^5.2.0",
      "@angular/platform-browser": "^5.2.0",
      "@angular/platform-browser-dynamic": "^5.2.0",
      "@angular/router": "^5.2.0",
      "angular-in-memory-web-api": "^0.6.0",
      "core-js": "^2.4.1",
      "rxjs": "^5.5.6",
      "zone.js": "^0.8.19"
    },
    "devDependencies": {
      "@angular/cli": "~1.7.1",
      "@angular/compiler-cli": "^5.2.0",
      "@angular/language-service": "^5.2.0",
      "@types/jasmine": "~2.8.3",
      "@types/jasminewd2": "~2.0.2",
      "@types/node": "~6.0.60",
      "codelyzer": "^4.0.1",
      "jasmine-core": "~2.8.0",
      "jasmine-spec-reporter": "~4.2.1",
      "karma": "~2.0.0",
      "karma-chrome-launcher": "~2.2.0",
      "karma-coverage-istanbul-reporter": "^1.2.1",
      "karma-jasmine": "~1.1.0",
      "karma-jasmine-html-reporter": "^0.2.2",
      "protractor": "~5.1.2",
      "ts-node": "~4.1.0",
      "tslint": "~5.9.1",
      "typescript": "~2.5.3"
    }
  }
  </code></pre>