ERROR in src/app/gyms/add/add.component.ts(11,10): error TS2305: Module '"C:/Users/Hp/Downloads/Compressed/angular-material-app-master/angular-material-app-master/node_modules/moment/moment"' has no exported member 'default'.

"dependencies": {
    "@angular/animations": "^5.1.2",
    "@angular/cdk": "^5.0.2",
    "@angular/common": "^5.1.2",
    "@angular/compiler": "^5.1.2",
    "@angular/core": "^5.1.2",
    "@angular/flex-layout": "^2.0.0-beta.12",
    "@angular/forms": "^5.1.2",
    "@angular/http": "^5.1.2",
    "@angular/material": "^5.0.2",
    "@angular/material-moment-adapter": "^5.0.4",
    "@angular/platform-browser": "^5.1.2",
    "@angular/platform-browser-dynamic": "^5.1.2",
    "@angular/router": "^5.1.2",
    "@angular/service-worker": "^5.1.2",
    "@swimlane/ngx-charts": "^7.0.1",
    "@swimlane/ngx-datatable": "^11.1.5",
    "@swimlane/ngx-dnd": "^3.1.0",
    "angular-calendar": "^0.22.1",
    "angularfire2": "^5.0.0-rc.4",
    "core-js": "^2.5.3",
    "d3": "^4.12.0",
    "electron": "^1.7.10",
    "electron-packager": "^10.1.0",
    "firebase": "^4.8.0",
    "hammerjs": "^2.0.8",
    "material-design-icons": "^3.0.1",
    "ng2-charts": "^1.6.0",
    "ngx-perfect-scrollbar": "^5.0.5",
    "ngx-quill": "^2.0.4",
    "normalize.css": "^7.0.0",
    "rxjs": "^5.5.5",
    "screenfull": "^3.3.2",
    "zone.js": "^0.8.18"
  },
  "devDependencies": {
    "@angular/cli": "^1.6.2",
    "@angular/compiler-cli": "^5.1.2",
    "@angular/language-service": "^5.1.2",
    "@compodoc/compodoc": "^1.0.5",
    "@types/node": "^6.0.94",
    "codelyzer": "^3.2.2",
    "hads": "^1.6.0",
    "protractor": "^5.1.2",
    "ts-node": "^3.2.2",
    "tslint": "^5.7.0",
    "typescript": "^2.4.2"
  }

import { Component, OnInit } from '@angular/core';
import { FormControl } from '@angular/forms';
import { MomentDateAdapter } from '@angular/material-moment-adapter';
import { DateAdapter, MAT_DATE_FORMATS, MAT_DATE_LOCALE } from '@angular/material/core';

import * as _moment from 'moment';
import { default as _rollupMoment } from 'moment';
const moment = _rollupMoment || _moment;

export const MY_FORMATS = {
  parse: {
    dateInput: 'LL',
  },
  display: {
    dateInput: 'LL',
    monthYearLabel: 'MMM YYYY',
    dateA11yLabel: 'LL',
    monthYearA11yLabel: 'MMMM YYYY',
  },
};
@Component({
  selector: 'app-add',
  templateUrl: './add.component.html',
  styleUrls: ['./add.component.scss'],
  providers: [
    { provide: DateAdapter, useClass: MomentDateAdapter, deps: [MAT_DATE_LOCALE] },

    { provide: MAT_DATE_FORMATS, useValue: MY_FORMATS },
  ],
})

export class AddComponent implements OnInit {

  date = new FormControl(moment());
  username: string = '';
  password: string = '';
  email: string = '';
  submitted: boolean = false;
  citySelect = new FormControl(true);
  constructor() { }

  ngOnInit() {

  }

}