Cannot save data after clicking Save button

I want to change data and it's called "Paket". then, I'm clicking Save "Simpan" button, but the data cannot be saved, and it shows red words "Layanan Paket & Tambahan (Tersimpan) yang dipilih tidak valid.", I don't know what happened. And i don't have experience with PHP, Laravel, filament, or livewire.
any ideas why?
this is github link https://github.com/ChoriErola/wedding-organizer.git