Method Filament\Forms\Form::submitAction does not exist.

Hello, i get Method Filament\Forms\Form::submitAction does not exist when try to add

->submitAction(new HtmlString('<button type="submit">Submit</button>'));

->submitAction(new HtmlString('<button type="submit">Submit</button>'));

->submitAction(new HtmlString('<button type="submit">Submit</button>'));

->submitAction(new HtmlString('<button type="submit">Submit</button>'));

below Wizard Form.

Anyone can help?