文件陣列中具有角4

上傳文件我選擇像這樣在模板的文件：文件陣列中具有角4

<input type="file" #fileupload [(ngModel)]="myFile" name="myFile" (change)="fileChange(fileupload.files)" />

然後在組件使用該功能來操縱對象：

fileChange(event){ 
console.log(event); 
this.myFile = event[0];}

編譯爲OK，並且沒有錯誤，但我得到這個錯誤在瀏覽器中：

ERROR Error: [object Object] 
at viewWrappedDebugError (core.es5.js:8410) 
at callWithDebugContext (core.es5.js:13475) 
at Object.debugHandleEvent [as handleEvent] (core.es5.js:13053) 
at dispatchEvent (core.es5.js:8602) 
at core.es5.js:9213 
at HTMLInputElement.<anonymous> (platform-browser.es5.js:2651) 
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:424) 
at Object.onInvokeTask (core.es5.js:3881) 
at ZoneDelegate.webpackJsonp.../../../../zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:423) 
at Zone.webpackJsonp.../../../../zone.js/dist/zone.js.Zone.runTask (zone.js:191)

而且

ERROR Error: Uncaught (in promise): InvalidStateError: Failed to set the 'value' property on 'HTMLInputElement': This input element accepts a filename, which may only be programmatically set to the empty string. 
Error: Failed to set the 'value' property on 'HTMLInputElement': This input element accepts a filename, which may only be programmatically set to the empty string.

事實上，我可以看到對象包含我選擇的文件，但仍然出現錯誤。