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Q: Angular2 updating from beta15 to beta16 After editing my package.json and running npm install, I get this error when I try to run my app in the browser: angular2-polyfills.min.js:1 Unhandled Promise rejection: Error: Trying to create a class provider but "undefined" is not a class! at new BaseException (http://localhost:3000/angular2/src/facade/exceptions.js:17:23) at ProviderBuilder.toClass (http://localhost:3000/angular2/src/core/di/provider.js:197:19) at Object.eval (http://localhost:3000/js/app.js:62:44) at eval (http://localhost:3000/js/app.js:67:4) Evaluating http://localhost:3000/js/app.js Error loading http://localhost:3000/js/app.js ; Zone: <root> ; Task: Promise.then ; Value: Error: Error: Trying to create a class provider but "undefined" is not a class!(…) I am a bit lost on where to look for my error. I am very grateful for your help in pointing me in the right direction. code per request in comments: (function(require, exports, module, __filename, __dirname, global, GLOBAL) {'use strict';"use strict"; var __extends = (this && this.__extends) || function (d, b) { for (var p in b) if (b.hasOwnProperty(p)) d[p] = b[p]; function __() { this.constructor = d; } d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __()); }; var base_wrapped_exception_1 = require('./base_wrapped_exception'); var exception_handler_1 = require('./exception_handler'); var exception_handler_2 = require('./exception_handler'); exports.ExceptionHandler = exception_handler_2.ExceptionHandler; var BaseException = (function (_super) { __extends(BaseException, _super); function BaseException(message) { if (message === void 0) { message = "--"; } _super.call(this, message); this.message = message; this.stack = (new Error(message)).stack; } BaseException.prototype.toString = function () { return this.message; }; return BaseException; }(Error)); exports.BaseException = BaseException; second edit: { "name": "angular2-express-starter", "version": "1.0.0", "description": "Starter application of Angular2 on Express", "main": "gulpfile.js", "private": true, "scripts": { "watch": "gulp watch", "start": "node ./server/bin/www", "postinstall": "gulp" }, "author": "Benjamin McFerren", "license": "", "dependencies": { "angular2": "2.0.0-beta.17", "body-parser": "~1.13.2", "cookie-parser": "~1.3.5", "del": "^2.2.0", "es6-promise": "^3.1.2", "es6-shim": "^0.35.0", "express": "^4.13.4", "gulp": "^3.9.1", "gulp-sourcemaps": "^1.6.0", "gulp-tslint": "^3.6.0", "gulp-typescript": "^2.11.0", "jsonwebtoken": "^5.5.4", "morgan": "~1.6.1", "ng-semantic": "^1.0.15", "reflect-metadata": "0.1.2", "rxjs": "5.0.0-beta.6", "serve-favicon": "~2.3.0", "systemjs": "^0.19.20", "zone.js": "0.6.12" }, "devDependencies": { "underscore": "^1.8.3" } } edit three: app.ts import { Component, View, bind } from "angular2/core"; import { HTTP_PROVIDERS } from "angular2/http"; import { bootstrap } from "angular2/platform/browser"; import { ROUTER_PROVIDERS, RouterOutlet, LocationStrategy, RouteConfig, HashLocationStrategy } from "angular2/router"; import { Container } from "./components/container/container"; import {DATA_BINDINGS} from "./service/dataservice"; import ... ... @Component({ selector: "app", directives: [RouterOutlet], template: `<router-outlet></router-outlet>` }) @RouteConfig([ { component: Container, path: "/" }, ... ]) bootstrap(AppComponent, [ ROUTER_PROVIDERS, // [HTTP_PROVIDERS, provide(RequestOptions, {useClass: MyOptions})], HTTP_PROVIDERS, DATA_BINDINGS, ... bind(LocationStrategy).toClass(HashLocationStrategy) ]); dataservice.ts import {Injectable, EventEmitter} from "angular2/core"; import {Http} from "angular2/http"; import {Location} from "angular2/router"; import {Observable} from "rxjs/Observable"; import "rxjs/Rx"; ... @Injectable() export class DataService { result: Object; error: Object; http: Http; items: Array<any>; ... constructor(http: Http, location: Location, public ..., ...) { ... } ... } export var DATA_BINDINGS: Array<any> = [ DataService ]; A: Location-related bits were moved import { PlatformLocation, Location, LocationStrategy, HashLocationStrategy, PathLocationStrategy, APP_BASE_HREF} from 'angular2/platform/common' See also Location and HashLocationStrategy stopped working in beta.16