Checkbox Two Way Data Binding, Angular version 9.1.12

my job is to do the following functionality. I have 3 checkboxes and after selecting one I want the other two to also be selected.

I use a ready-made component to create the checkbox.

<form [formGroup]="data" name="name" >
  <div class="form-group">
    <div class="form__element">
      <nb-checkbox name="groupname" value="Check All" label="Check All" formControlName="isAgree" [(ngModel)]="myVar2" [ngModelOptions]="{standalone: true}"></nb-checkbox>
    </div>
  </div>

  <div class="features__box">
    <section class="agreements">
          <ul class="features__list">
        <li class="features__item" *ngFor="let agreement of data.agreements.value">
          <div class="form__element">
            <nb-checkbox name="groupname" value= label= [checked]="myVar2" (change)="myVar2 = !myVar2"></nb-checkbox>
          </div>
        </li>
      </ul>
    </section>
    <section class="statements">
          <ul class="features__list">
        <li class="features__item" *ngFor="let statement of data.statements.value">
          <div class="form__element">
            <nb-checkbox name="groupname" value= label= [checked]="myVar2" (change)="myVar2 = !myVar2"></nb-checkbox>
          </div>
        </li>
      </ul>
    </section>
  </div>
</form>

I added [(ngModel)] =" myVar2 "[ngModelOptions] =" {standalone: true} " to my main checkbox, and I added [checked] =" myVar2 "(change) =" myVar2 =! myVar2 to my next checkbox. In the file.component.ts file I addedmyVar2: boolean = false;

However, the above solution does not work. I get the following errors in the console

    
    ERROR in src/app/file.component.html:64:66 - error NG8002: Can't bind to 'ngModelOptions' since
it isn't a known property of 'nb-checkbox'.
    1. If 'nb-checkbox' is an Angular component and it has 'ngModelOptions' input, then verify that it is part of this module.
    2. If 'nb-checkbox' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
    3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component.
    
    64                   formControlName="isAgree" [(ngModel)]="myVar2" [ngModelOptions]="{standalone: true}"></nb-checkbox>
                                                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    
      src/app/file.component.ts:14:16
        14   templateUrl: './file.component.html',
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        Error occurs in the template of component CeidgPositiveComponent.
    src/app/file.component.html:94:121 - error NG8002: Can't bind to 'checked' since it isn't a known property of 'nb-checkbox'.
    1. If 'nb-checkbox' is an Angular component and it has 'checked' input, then verify that it is part of this module.
    2. If 'nb-checkbox' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.
    3. To allow any property add 'NO_ERRORS_SCHEMA' to the '@NgModule.schemas' of this component.
    
    94                     <nb-checkbox name="groupname" value= label= [checked]="myVar2" (change)="myVar2 = !myVar2"></nb-checkbox>
                                                                                                                               ~~~~~~~~~~~~~~~~~~
    
      src/app/file.component.ts:14:16
        14   templateUrl: './file.component.html',
                          ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
        Error occurs in the template of component File.

I have imported modules import {FormsModule, ReactiveFormsModule} from '@ angular / forms'; import {NgxsModule} from '@ ngxs / store';

Does anyone know how to solve this problem?