Method Filament\Panel::assets does not exist.

public function panel(Panel $panel): Panel
{
    return $panel
        ->id('seller')
        ->path('my-shop')
        ->colors([
            'primary' => Color::Blue,
        ])
        ->assets([
            Css::make('custom-stylesheet', resource_path('css/seller-panel.css')),
            Js::make('custom-script', resource_path('js/seller-panel.js')),
        ])
}

Method Filament\Panel::assets does not exist.