Laravel - The POST method is not supported for this route. Supported methods: GET, HEAD

this is my laravel orchid screen

\<?php

namespace App\Orchid\Screens\Examples;

use App\Models\Contact;
use Illuminate\Http\Request;
use App\Models\User;
use Maatwebsite\Excel\Concerns\ToModel;
use Illuminate\Mail\Message;
use Illuminate\Support\Facades\Mail;
use Orchid\Screen\Fields\Input;
use Orchid\Screen\Fields\Quill;
use Orchid\Screen\Fields\Relation;
use Orchid\Screen\Fields\Textarea;
use Orchid\Support\Facades\Layout;
use Orchid\Screen\Actions\Button;
use Orchid\Screen\Screen;
use Orchid\Support\Facades\Alert;


class ExampleFieldsAdvancedScreen extends Screen
{
    /**
     * Query data.
     *
     * @return array
     */
    public function query(): iterable
    {
        return [
        ];
    }

    /**
     * Display header name.
     *
     * @return string|null
     */
    public function name(): ?string
    {
        return 'Bulk Add or Bulk Send';

    }


    /**
     * Display header description.
     *
     * @return string|null
     */
    public function description(): ?string
    {
        return 'Upload contact csv or create new.';
        
        
    }

    /**
     * Button commands.
     *
     * @return Action[]
     */
    public function commandBar(): iterable
    {
        return [
            Button::make('Upload')
            ->method('POST')
            ->icon('paper-plane')

            
                    
        ];
    }
    //upload the csv file
    public function Upload(Request $request)
    {
        request()->validate([
            'users' => 'required|mimes:xlx,xls|max:2048'
        ]);
        $attachment = $file->load();
        Excel::import(new ContactImport, $request->file('users'));
        return back()->with('massage', 'User Imported Successfully');
    }
    /**
     * Views.
     *
     * @throws \Throwable
     *
     * @return \Orchid\Screen\Layout[]
     */
    public function layout(): iterable
    {
        return [

        Layout::rows([

                Input::make('users')
                    ->type('file')
                    ->title('Upload one csv file')
                    ->horizontal(),

                Relation::make('contacts.')
                    ->title('recipients')
                    ->multiple()
                    ->required()
                    ->placeholder('Mobile Number')
                    ->help('Enter the users that you would like to send this message to.')
                    ->fromModel(Contact::class,'name','mobile'),

               

                TextArea::make('post.description')
                    ->title('Enter the message you want to send')
                    ->rows(3)
                    ->maxlength(200)
                    ->placeholder('Currently Flex is Down'),
                
                Button::make('Send Message')
                    ->method('sendMessage')
                    ->icon('paper-plane')
              
                    

 ])->title('Contacts upload'),

        
        ];

        
    }
}