CheckboxList Issue on Custom Livewire page

class AstiWizardComponent extends Component implements HasForms, HasActions
{
    use InteractsWithActions;

    use InteractsWithForms;

    public ?array $data = [];
    public $importoMultilinea;
    //public $allocazione; <---- IT CAUSE ERROR :(

CheckboxList::make('allocazione')
                            ->options([
                                'obbligazionaria' => 'Obbligazionaria',
                                'prudente' => 'Prudente',
                                'moderata' => 'Moderata',
                                'azionaria' => 'Azionaria',
                                'libera' => 'Linera',
                            ])
                            ->reactive()
                            ->columns(5)