Estoy tratando de instalar las dependencias del paquete npm en mi aplicación angular y recibo este error. ¿Alguna ayuda para arreglar esto?

 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\Roaming\npm-cache\_logs\2020-02-12T13_07_17_602Z-debug.log

Adjuntaré mi archivo package.json aquí.

 { "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" } }