错误：表单控件的值访问器没有名称：＆＃39; floatLabel＆＃39;

Question

Error: No value accessor for form control with name: 'floatLabel'.

我使用了链接

中的演示代码

https://stackblitz.com/angular/moyrdxvdbdxv

https://material.angular.io/components/form-field/examples

HTML

<div class="example-container">
    <form class="example-container" [formGroup]="options">
        <mat-checkbox formControlName="hideRequired">Hide required marker</mat-checkbox>
        <div>
            <label>Float label: </label>
            <mat-radio-group formControlName="floatLabel">
                <mat-radio-button value="auto">Auto</mat-radio-button>
                <mat-radio-button value="always">Always</mat-radio-button>
                <mat-radio-button value="never">Never</mat-radio-button>
            </mat-radio-group>
        </div>
    </form>