Angular ERROR Error: Cannot find control with name: 'imageCode'

<form nz-form [formGroup]="validateForm" class="login-form" (ngSubmit)="submitForm()">
<nz-form-item>
      <nz-form-control nzErrorTip="请输入验证码" class="login-imagecode">
        <nz-input-group nzPrefixIcon="user">
          <input type="text" nz-input formControlName="imageCode" placeholder="验证码" />
        </nz-input-group>
      </nz-form-control>
    </nz-form-item>
</form>