Angular 6无法读取未定义的属性“ getScroll”

Question

到目前为止，当我运行我的角度应用程序时，我在下面看到这样的错误。

    at updatePosition (vendor.39816f62eefbe817c97e.js:1)
    at e.invokeTask (polyfills.8b3031f6891125c33792.js:1)
    at Object.onInvokeTask (vendor.39816f62eefbe817c97e.js:1)
    at e.invokeTask (polyfills.8b3031f6891125c33792.js:1)
    at t.runTask (polyfills.8b3031f6891125c33792.js:1)
    at t.invokeTask [as invoke] (polyfills.8b3031f6891125c33792.js:1)
    at _ (polyfills.8b3031f6891125c33792.js:1)
    at m (polyfills.8b3031f6891125c33792.js:1)

package.json

   "dependencies": {
    "@angular/animations": "^6.1.0",
    "@angular/cdk": "^6.4.7",
    "@angular/common": "^6.1.0",
    "@angular/compiler": "^6.1.0",
    "@angular/core": "^6.1.0",
    "@angular/forms": "^6.1.0",
    "@angular/http": "^6.1.0",
    "@angular/platform-browser": "^6.1.0",
    "@angular/platform-browser-dynamic": "^6.1.0",
    "angularfire2": "^5.0.0-rc.4"   //I already installed
     }