HasOne error

[HeadStudios]

Hi,

I am getting this error Call to protected method Whitecube\NovaFlexibleContent\Layouts\Layout::relationLoaded() from scope Laravel\Nova\Fields\HasOne

When trying to add a HasOne field to Flexible like so:

 public function fields(NovaRequest $request)
    {
        return [
            ID::make()->sortable(),
            Flexible::make('Sequence')->fullWidth()
            ->addLayout('Email Prop', 'email_single', [
                HasOne::make('Contact'),
                Text::make('Subject'),
                Markdown::make('Email Body'),
                Number::make('Delay Days'),
                Number::make('Delay Hours'),
            ])->addLayout('SMS Prop', 'sms_single', [
                Textarea::make('Message'),
                Number::make('Delay Days'),
                Number::make('Delay Hours'),
            ]),

        ];
    }

Thank you!