title: ERROR in Cannot read property 'fileName' of null After updating Angular 7 to Angular 9
body: <p>I'm getting an  ERROR in Cannot read property 'fileName' of null after updating angular 7 to 9. I have updated all of my dependencies to the latest version. </p>
  
  <p><a href="https://i.stack.imgur.com/hIZVu.png" rel="noreferrer"><img src="https://i.stack.imgur.com/hIZVu.png" alt="enter image description here"></a></p>
  
  <p><strong><em>package.json</em></strong></p>
  
  <pre><code>{
      "name": "project name",
      "version": "0.0.0",
      "license": "MIT",
      "scripts": {
          "ng": "ng",
          "start": "ng serve",
          "build": "ng build",
          "test": "ng test",
          "lint": "ng lint",
          "e2e": "ng e2e"
      },
      "private": true,
      "dependencies": {
          "@angular/animations": "9.0.6",
          "@angular/cdk": "^9.1.3",
          "@angular/cli": "9.0.6",
          "@angular/common": "9.0.6",
          "@angular/compiler": "9.0.6",
          "@angular/core": "9.0.6",
          "@angular/forms": "9.0.6",
          "@angular/http": "7.2.16",
          "@angular/platform-browser": "9.0.6",
          "@angular/platform-browser-dynamic": "9.0.6",
          "@angular/router": "9.0.6",
          "@ngui/datetime-picker": "^0.16.2",
          "angular-flash-message": "^3.4.0",
          "angular2-clipboard": "^2.0.14",
          "angular2-color-picker": "^1.3.1",
          "angular2-cookie": "^1.2.6",
          "angular2-flash-messages": "^3.0.1",
          "angular2-modal": "^3.0.3",
          "angular2-multiselect-dropdown": "^4.6.3",
          "chart.js": "^2.9.3",
          "chart.piecelabel.js": "^0.15.0",
          "chartjs-plugin-datalabels": "^0.7.0",
          "chartjs-plugin-labels": "^1.1.0",
          "core-js": "^3.6.4",
          "file-saver": "^2.0.2",
          "file-saver-typescript": "^1.0.1",
          "jasmine-core": "^3.5.0",
          "jasmine-spec-reporter": "^4.2.1",
          "jspdf": "^1.5.3",
          "jspdf-autotable": "^3.2.13",
          "moment-timezone": "^0.5.28",
          "ng-circle-progress": "^1.5.1",
          "ng-click-outside": "^6.0.0",
          "ng-diff-match-patch": "^3.0.1",
          "ng-pick-datetime": "^7.0.0",
          "ng-pick-datetime-moment": "1.0.8",
          "ng2-charts": "^2.3.0",
          "ng2-ckeditor": "^1.2.7",
          "ng2-completer": "^3.0.3",
          "ng2-dnd": "^5.0.2",
          "ng2-pdf-viewer": "^6.1.2",
          "ng5-breadcrumb": "^0.0.6",
          "ngx-bootstrap": "5.5.0",
          "ngx-bootstrap-modal": "^2.0.1",
          "ngx-chips": "^2.1.0",
          "ngx-clipboard": "^13.0.0",
          "ngx-color-picker": "^9.0.0",
          "ngx-pagination": "^5.0.0",
          "ngx-popover": "0.0.16",
          "ngx-progressbar": "^6.0.2",
          "ngx-toastr": "^12.0.0",
          "pluralize": "^8.0.0",
          "rxjs": "^6.5.4",
          "rxjs-compat": "^6.5.4",
          "tslib": "^1.11.1",
          "web-animations-js": "2.3.2",
          "xlsx": "^0.15.6",
          "zone.js": "^0.10.3"
      },
      "devDependencies": {
          "@angular-devkit/build-angular": "^0.900.6",
          "@angular/compiler-cli": "9.0.6",
          "@angular/language-service": "9.0.6",
          "@types/jasmine": "3.5.9",
          "@types/node": "^13.9.1",
          "codelyzer": "~5.2.1",
          "jasmine-spec-reporter": "^4.1.1",
          "karma": "^4.4.1",
          "karma-chrome-launcher": "~3.1.0",
          "karma-cli": "~2.0.0",
          "karma-coverage-istanbul-reporter": "^2.1.1",
          "karma-jasmine": "~3.1.1",
          "karma-jasmine-html-reporter": "^1.5.2",
          "protractor": "^5.4.3",
          "ts-node": "~8.6.2",
          "tslint": "~6.1.0",
          "typescript": "3.8.3"
      } }
  </code></pre>
  
  <p>When I tried to serve, build the application, it getting the same error. Is there any possibility to track the location of this error?. Is it related to any of the dependencies that I having using currently?
  Can any please help me to fix this issue.</p>