javascript - Error: Datepicker: value not recognized as a date object by DateAdapter -


from yesterday i'm struggling problem angular material 2 datepicker, before last npm install working , get: 

error error: datepicker: value not recognized date object dateadapter. holidayrequestcomponent.html:21

21st line <input starts

<md-input-container [formgroup]="daterangeform">   <input    mdinput    name="date_from"    [mddatepicker]="from"    placeholder="start date"    formcontrolname="holidaydatacontrol"    [ngmodel]="date_from"   > <md-datepicker-toggle mdsuffix [for]="from"></md-datepicker-toggle> </md-input-container> <md-datepicker #from></md-datepicker>

my component.ts:

import {component, oninit, inject } '@angular/core'; import {md_dialog_data, mddialog } '@angular/material'; import {formbuilder, formcontrol, formgroup, ngform, validators} '@angular/forms'; import {observable} 'rxjs/observable';   @component({   selector: 'app-holiday-request',   templateurl: './holiday-request.component.html',   styleurls: ['./holiday-request.component.css'] })  export class holidayrequestcomponent implements oninit {    public date_from = new date();    constructor(@inject(md_dialog_data) public data: any,               private fb: formbuilder,               ) {        this.daterangeform = new formgroup({         holidaydatacontrol: new formcontrol('', validators.required)       });        }   }

according https://github.com/angular/material2/issues/6265

an empty string not acceptable value , raising following error:

datepicker: value not recognized date object dateadapter.

so solutions change 

this.daterangeform = new formgroup({         holidaydatacontrol: new formcontrol('', validators.required)       });

to

this.daterangeform = new formgroup({         holidaydatacontrol: new formcontrol(null, validators.required)       });

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