عدم ارسال ایمیل

سلام و خسته نباشین 
وقتی که آدرس http://127.0.0.1:8000/auth/email/send-verification رو تایپ میکنم ایمیل ارسال نمیشه و ارور میده 

ارور به صورت Trying to access array offset on value of type null
 هستش 

ممنون میشم پاسخ بدین

user

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Foundation\Auth\User as Authenticatable;
use App\Jobs\SendEmail;
use App\Mail\VerificationEmail;
use App\Mail\ResetPassword;
use App\Services\Auth\Traits\MagicallyAuthenticable;
use App\Services\Auth\Traits\HasTwoFactor;

class User extends Authenticatable
{
    use Notifiable, MagicallyAuthenticable, HasTwoFactor;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password', 'phone_number', 'provider', 'provider_id', 'email_verified_at', 'avatar'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'email_verified_at' => 'datetime',
    ];

    public function sendEmailVerificationNotification()
    {
        sendEmail::dispatchNow($this,new VerificationEmail($this));
    }

}

verificationController

<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use Illuminate\Foundation\Auth\VerifiesEmails;
use Illuminate\Support\Facades\Auth;
use League\OAuth1\Client\Server\Tumblr;
use Illuminate\Http\Request;
use Illuminate\Auth\Access\AuthorizationException;

class VerificationController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Email Verification Controller
    |--------------------------------------------------------------------------
    |
    | This controller is responsible for handling email verification for any
    | user that recently registered with the application. Emails may also
    | be re-sent if the user didn't receive the original email message.
    |
    */

    // use VerifiesEmails;

    /**
     * Where to redirect users after verification.
     *
     * @var string
     */
    protected $redirectTo = '/home';

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('auth');
        $this->middleware('signed')->only('verify');
        $this->middleware('throttle:6,1')->only('verify', 'send');
    }

    public function send()
    {
        Auth::user()->sendEmailVerificationNotification();
//        dd(Auth::user());
        //get user
        //create signed route
        //send url

        // redirect
    }

    public function verify()
    {
        return 'dd';
    }
}

verification email

<?php

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;
use App\User;
use Illuminate\Support\Facades\URL;

class VerificationEmail extends Mailable
{
    use Queueable, SerializesModels;

    private $user;
    /**
     * Create a new message instance.
     *
     * @return void
     */
    public function __construct(User $user)
    {
        $this->user = $user;
    }

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        return $this->markdown('emails.verification-email')->with([
            'link' => $this->generateUrl(),
            'name' => $this->user->name
        ]);
    }


   protected function generateUrl(){
        return URL::temporarySignedRoute('auth.email.verify',now()->addMinute(120),['email'=>$this->user->email]);
   }
}

web

<?php

/*
|--------------------------------------------------------------------------
| Web Routes
|--------------------------------------------------------------------------
|
| Here is where you can register web routes for your application. These
| routes are loaded by the RouteServiceProvider within a group which
| contains the "web" middleware group. Now create something great!
|
*/

use Illuminate\Support\Facades\Route;
use Illuminate\Support\Facades\URL;


Route::get('/',function (){
   return view('welcome');
//   $url=URL::temporarySignedRoute('test',now()->addMinute(60),['id'=>'12']);
//   dd($url);
})->name('home');

Route::group(['prefix'=>'auth','namespace'=>'Auth'],function (){
    Route::get('register','RegisterController@showRegistrationForm')->name('auth.register.form');
    Route::post( 'register','RegisterController@register')->name('auth.reg ster');
    Route::get('login','loginController@showLoginForm')->name('auth.login.form');
    Route::post('login','loginController@login')->name('auth.login');
    Route::get('logout','loginController@logout')->name('auth.logout');
    Route::get('email/send-verification','VerificationController@send')->name('auth.email.send.verification');
    Route::get('email/verify','VerificationController@verify')->name('auth.email.verify');
});
Route::get('test',function (){
   return 'hi';
})->name('test');