は、私は、このAngular2コードを持っているヌルエラーの「QUERY」

Question

プロパティを読み取ることができません：

import 'babel-polyfill'; 
import 'zone.js/dist/zone'; 
import { bootstrap } from "@angular/platform-browser-dynamic"; 

import { Component, ViewChild } from '@angular/core'; 
import Other from "./Other"; 

@Component({ 
    selector: "app", 
    templateUrl: "app.html", 
// directives: [Other] 
}) 
export default class AppComponent { 

// @ViewChild(Other) other: Other; 

    constructor() { 
    } 
} 

bootstrap(AppComponent); 

私はコメント行のコメントを解除した場合、私はこのエラーを取得する：クラスOtherが持っていたので

EXCEPTION: TypeError: Cannot read property 'query' of null (index):68 
EXCEPTION: Error: Uncaught (in promise): TypeError: Cannot read property 'query' of null (index):76 
STACKTRACE:window.console.error @ (index):76 
BrowserDomAdapter.logError @ browser_adapter.js:77 
ExceptionHandler.call @ exception_handler.js:59 
(anonymous function) @ application_ref.js:265 
schedulerFn @ async.js:123 
SafeSubscriber.__tryOrUnsub @ Subscriber.js:225 
SafeSubscriber.next @ Subscriber.js:174 
Subscriber._next @ Subscriber.js:124 
Subscriber.next @ Subscriber.js:88 
Subject._finalNext @ Subject.js:128 
Subject._next @ Subject.js:120 
Subject.next @ Subject.js:77 
EventEmitter.emit @ async.js:112 
NgZone._zoneImpl.ng_zone_impl_1. 
NgZoneImpl.onError @ ng_zone.js:120 
NgZoneImpl.inner.inner.fork.onHandleError @ ng_zone_impl.js:66 
ZoneDelegate.handleError @ zone.js:327 
Zone.runGuarded @ zone.js:233 
_loop_1 @ zone.js:487 
drainMicroTaskQueue @ zone.js:494 
ZoneTask.invoke @ zone.js:426 (index):76 
Error: Uncaught (in promise): TypeError: Cannot read property 'query' of null 
    at resolvePromise (zone.js:538) 
    at PromiseCompleter.reject (zone.js:515) 
    at application_ref.js:295 
    at ZoneDelegate.invoke (zone.js:323) 
    at Object.NgZoneImpl.inner.inner.fork.onInvoke (ng_zone_impl.js:45) 
    at ZoneDelegate.invoke (zone.js:322) 
    at Zone.run (zone.js:216) 
    at zone.js:571 
    at ZoneDelegate.invokeTask (zone.js:356) 
    at Object.NgZoneImpl.inner.inner.fork.onInvokeTask (ng_zone_impl.js:36) 
window.console.error @ (index):76 
BrowserDomAdapter.logError @ browser_adapter.js:77 
ExceptionHandler.call @ exception_handler.js:60 
(anonymous function) @ application_ref.js:265 
schedulerFn @ async.js:123 
SafeSubscriber.__tryOrUnsub @ Subscriber.js:225 
SafeSubscriber.next @ Subscriber.js:174 
Subscriber._next @ Subscriber.js:124 
Subscriber.next @ Subscriber.js:88 
Subject._finalNext @ Subject.js:128 
Subject._next @ Subject.js:120 
Subject.next @ Subject.js:77 
EventEmitter.emit @ async.js:112 
NgZone._zoneImpl.ng_zone_impl_1.NgZoneImpl.onError @ ng_zone.js:120 
NgZoneImpl.inner.inner.fork.onHandleError @ ng_zone_impl.js:66 
ZoneDelegate.handleError @ zone.js:327 
Zone.runGuarded @ zone.js:233 
_loop_1 @ zone.js:487 
drainMicroTaskQueue @ zone.js:494 
ZoneTask.invoke @ zone.js:426 
(index):76 
Unhandled Promise rejection:window.console.error @ (index):76 
consoleError @ zone.js:461 
_loop_1 @ zone.js:490 
drainMicroTaskQueue @ zone.js:494 
ZoneTask.invoke @ zone.js:426 
(index):76 
Error: Uncaught (in promise): TypeError: Cannot read property 'query' of null(…)window.console.error @ (index):76 
consoleError @ zone.js:463 
_loop_1 @ zone.js:490 
drainMicroTaskQueue @ zone.js:494 
ZoneTask.invoke @ zone.js:426 
socket.io.js:5120 
Uncaught RangeError: Maximum call stack size exceeded 

Answer 1

これが起こっていました2つの引数を持つコンストラクタ私がそれらの議論を取り除くとすぐに、それはうまくいった。

エラーメッセージは奇妙なものです。