Angular2 checkbox with primeng fails

I am using angular2 cli and this is the way i have setup my form

In the component

export class UsersAddComponent implements OnInit {

 ngOnInit() {
    this.userForm = this._formBuilder.group({
      role: ['', [Validators.required]],
      others: this._formBuilder.array([])  //for adding multipe form inputs
    });

   this.addNewUser();

  }

  initAddress() {
     return this._formBuilder.group({     
       sendcred: [''],  //checkbox needs no validation in my logic
        needs_reset: [''], // ''
        .....other fields here
    });
 }


  addNewUser() {  //this is called whenever add new user button is clicked
     const control = <FormArray>this.userForm.controls['others'];
     const addrCtrl = this.initAddress();
     control.push(addrCtrl);
   }

In the html template am using primeng checkbox like this

  <p-checkbox formControlName="needs_reset" label="User has to set password" 
   (onChange)="Onpwdchange()"></p-checkbox>

  <p-checkbox formControlName="sendcred" name="send cred"  label="Send user
 login credentials " (onChange)="Oncredchange()"></p-checkbox>

The methods onpwdchange() and oncredchange() just have a console.log("clicked")

Whenever i check the checkboxes am getting an error

this.model.push is not a function  //i havent implemented push method anywhere

Ive checked on This primeng2 issue but they advice use of disableDeprecatedForms() and provideForms() which are not available in angular2 cli

How do i solve this issue