无法读取null

Question

我是Angular的新手，如果我的问题很愚蠢，我会很抱歉。我有以下问题：

我已按要求工作并且该问题不会影响应用程序的行为：应用程序构建，启动并正常工作，尽管编译错误“无法读取属性'isSkipSelf'为null”在我的组件上 The compilation error

我的package.json：

  {
  "name": "shopping-store",
  "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/cdk": "^5.2.5",
    "@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/material": "^5.2.5",
    "@angular/platform-browser": "^5.2.0",
    "@angular/platform-browser-dynamic": "^5.2.0",
    "@angular/router": "^5.2.0",
    "core-js": "^2.4.1",
    "hammerjs": "^2.0.8",
    "rxjs": "^5.5.6",
    "zone.js": "^0.8.19"
  },
  "devDependencies": {
    "@angular/cli": "1.6.5",
    "@angular/compiler-cli": "^5.2.0",
    "@angular/language-service": "^5.2.10",
    "@types/jasmine": "~2.8.3",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "angular-ide": "^0.9.39",
    "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"
  }
}

和我的app.module.ts：

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';


import { AppComponent } from './app.component';
import { CartComponent } from './cart/cart.component';
import { FormsModule } from '@angular/forms';
import {MatGridListModule} from '@angular/material/grid-list';


@NgModule({
  declarations: [
    AppComponent,
    CartComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    MatGridListModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

env是Webclipse的Angular IDE ......