Error on Livewire validation

Hello, using Laravel 10 Livewire 3.

I have a form where I need to validate fields on conditions.

My Code:

PackOrderComponent.php:

<?php

namespace App\Livewire\Admin\Order;

use Livewire\Component;
use Jantinnerezo\LivewireAlert\LivewireAlert;
use App\Livewire\Admin\Order\OrderPackedForm;
use App\Traits\OrderTrait;
use App\Models\Box;
use App\Models\Order;

class PackOrderComponent extends Component
{
    use LivewireAlert, OrderTrait;
    public Order $order;
    public $boxes;
    public $boxes_used = [];
    public $no_boxes_used;
    public $packed_from;
    public $till_slip_date;
    public $ask_if_ground;
    public $show_till_date;
    public OrderPackedForm $form;

    public function mount(Order $order)
    {
        $this->order = $order;
        $this->boxes = Box::where('active', 1)->get();
        $this->form->setup($order);
    }

    public function packed()
    {
        $this->form->store();
    }

    public function render()
    {
        return view('livewire.admin.order.pack-order-component')->extends('layouts.admin.master');
    }
}

PackOrderForm.php

namespace App\Livewire\Admin\Order;

use Livewire\Form;
use Illuminate\Validation\Rule;
use Illuminate\Support\Carbon;
use App\Enums\StatusEnum;
use App\Enums\PackedFromEnum;
use App\Enums\ShippingMethodEnum;
use App\Models\Box;
use App\Models\OrderItemView;
use App\Models\Order;

class OrderPackedForm extends Form
{
    public $boxes_used;
    public $no_boxes_used;
    public $packed_from;
    public $till_slip_date;
    public $till_slip_time;
    public $options_checked;
    public $errors;
    public Order $order;

    protected $rules = ['till_slip_time' => 'required'];

//If I try this and not the till_slip_time everything is fine
    //protected $rules = ['packed_from' => 'required'];

    public function setup(Order $order): void
    {
        $this->order = $order;
        $this->no_boxes_used = $order->shipping_method != ShippingMethodEnum::COURIER;
        $this->boxes_used = [];
        $this->options_checked = 0;
        $this->packed_from = $order->customer->dispatch_from_shop ? PackedFromEnum::SHOP : PackedFromEnum::WAREHOUSE;
        $this->till_slip_time = '';
    }

    public function store(): void
    {
        $till_slip_date_for_db = NULL;
        $this->errors = $this->getErrorBag();

        //Doing all the validations and stock updates if not rep
        if (!auth()->user()->hasRole("Sales Rep")) {
            $this->validate();

            if ($this->packed_from == PackedFromEnum::WAREHOUSE) {
                //Get all the items to pack and check if there are enough in stock
                $items = OrderItemView::where('order_id', $this->order->id)->get();

                foreach ($items as $item) {
                    if ($item->stock < $item->qty)
                        $this->errors->add($this->order->id . '-' . $item->id, "You don't have enouth stock of $item->name in stock");
                }
            }

            if ($this->errors->any()) {
                dd('errors');
            } else {
                dd('no errors');
                if ($this->packed_from == PackedFromEnum::SHOP) {
                    $till_slip_date_for_db = Carbon::createFromFormat('!d/m/Y H:i', $this->till_slip_date . ' ' . $this->till_slip_time);
                }

                $this->order->update([
                    'status' => StatusEnum::DELIVER,
                    'packed_by' => auth()->id(),
                    'packed_from' => $this->packed_from,
                    'till_slip_date' => $till_slip_date_for_db
                ]);

                if (!empty($this->boxes_used)) {
                    foreach ($this->boxes_used as $key => $val) {
                        $box = Box::find($key);
                        $box->update(['stock' => $box->stock - $val]);
                    }
                }
            }
        }
    }
}

pack-order-component.blade.php:

<div>
    
<div class="card">
    
        <div class="card-header bg-light">Order ID: <span class="font-600">{{ $order->id }}</span> / Date: <span class="font-600">{{ $order->created_at }}</span></div>
        
        <div class="card-body">
    
            @if($order->customer->dispatch_from_shop)
            <div class="alert alert-info">Dispatch From Shop</div>
            @endif
    
            @if($order->updated)
                <div class="alert alert-danger">
                    <p>The order has been updated, would you like to send an email to the customer?</p>
                    <a href="{{ url('orders/send-update-email/' . $order->id) }}" class="btn btn-default btn-sm">Send Email</a>
                </div>
            @endif
        
            <livewire:admin.order.display-order-component :order="$order" :key="'order' .$order->id" />
    
            <x-livewire-form action="packed" submitBtnName="Packed" showRequired="0">
            
                @if(Auth::user()->hasRole('Sales Rep'))
                
                <input type="hidden" wire:model="form.packed_from" value="{{ \App\Enums\PackedFromEnum::SALESREP }}">
                
                @else

                    <div class="form-group">
                        <label for="packedFrom">Packed From</label>
                        <select wire:model="form.packed_from" class="form-control packedFrom">
                            <option value="{{ \App\Enums\PackedFromEnum::WAREHOUSE }}">Warehouse</option>
                            <option value="{{ \App\Enums\PackedFromEnum::SHOP }}">Shop</option>
                        </select>
                    </div>                   

                    <div class="form-group">
                        <label for="tillSlipTime">Till Slip Time</label>
                        <input type="text" wire:model="form.till_slip_time" class="form-control time @error('form.till_slip_time') is-invalid @enderror" id="tillSlipTime">
                        <x-display-error error="form.till_slip_time"/>
                    </div>                  
                
                @endif

            </x-livewire-form>
    
        </div>
    
    </div>
    

</div>

When submitting the form I get this error:

Property type not supported in Livewire for property: [[]]

What does this error mean? Why do I get it?