El atributo [LiveWire] no existe.
If you are using a recent install of Laravel 8,
you will have Livewire V2.
In this version, Route::livewire() romeved.
Instead, you specify a normal get() route,
with the action being the Livewire component class.
Route::get('/' , App\Http\Livewire\LandingPage::class);
Mohamad