No value accessor for form control with name: 'recipient'
You should add the ngDefaultControl attribute to your input like this:
<md-input [(ngModel)]="recipient" name="recipient" placeholder="Name" class="col-sm-4" (blur)="addRecipient(recipient)" ngDefaultControl></md-input>Taken from comments in this post:
angular2 rc.5 custom input, No value accessor for form control with unspecified name
Note: For later versions of @angular/material:
Nowadays you should instead write:
<md-input-container> <input mdInput [(ngModel)]="recipient" name="recipient" placeholder="Name" (blur)="addRecipient(recipient)"></md-input-container>
Make sure you import MaterialModule as well since you are using md-input which does not belong to FormsModule