npm ERR！找不到404-GET https://registry.npmjs.org/error-ex

我正在尝试将npm软件包依赖项安装到我的angular应用程序中，并且出现此错误。对解决这个问题有帮助吗？

npm ERR! code E404
npm ERR! 404 Not Found: error-ex@^1.2.0
npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\Dilushi\ApPDAta\roaR_307_11845@ing\npm-cache\_logs\2020-02-12T13_07_17_602Z-debug.log

我将package.json在此处附加文件。

{
  "name": "app-pfe","version": "0.0.1","scripts": {
    "ng": "ng","start": "ng serve","build": "ng build","test": "ng test","lint": "ng lint","e2e": "ng e2e"
  },"private": true,"dependencies": {
    "@angular/animations": "^6.0.2","@angular/common": "^6.0.2","@angular/compiler": "^6.0.2","@angular/core": "^6.0.2","@angular/forms": "^6.0.2","@angular/http": "^6.0.2","@angular/platform-browser": "^6.0.2","@angular/platform-browser-dynamic": "^6.0.2","@angular/router": "^6.0.2","@ng-dynamic-forms/core": "^6.0.6","@ng-SELEct/ng-SELEct": "^2.18.0","angular-webstorage-service": "^1.0.2","angular2-moment": "^1.9.0","core-js": "^2.5.4","inspector": "^0.5.0","jsrsasign": "^8.0.12","ngx-auth": "^5.0.0","ngx-bootstrap": "^5.0.0","node-sass": "^4.11.0","rxjs": "6.3.3","rxjs-compat": "6.3.3","underscore": "^1.9.1","zone.js": "^0.8.26"
  },"devDependencies": {
    "@angular-devkit/build-angular": "^0.13.8","@angular-devkit/build-ng-packagr": "~0.6.8","@angular/cli": "~6.0.2","@angular/compiler-cli": "^7.2.14","@angular/language-service": "^6.0.2","@types/jasmine": "~2.8.6","@types/jasminewd2": "~2.0.3","@types/node": "~8.9.4","codelyzer": "~4.2.1","jasmine-core": "~2.99.1","jasmine-spec-reporter": "~4.2.1","karma": "^4.0.1","karma-chrome-launcher": "~2.2.0","karma-coverage-istanbul-reporter": "~1.4.2","karma-jasmine": "~1.1.1","karma-jasmine-html-reporter": "^0.2.2","ng-packagr": "^5.1.0","protractor": "^5.4.1","ts-node": "~5.0.1","tsickle": ">=0.25.5","tslib": "^1.7.1","tslint": "~5.9.1","typescript": "3.1.1"
  }
}