错误当我想验证空字段并将它们保存在laravel中时：“此路由不支持GET方法。 支持的方法：POST。“

I wrote a simple code to validate input data and save them. But when I leave some fields null I get this error :

The GET method is not supported for this route. Supported methods: POST.

Despite using the post method.

Laravel Framework 5.8.22 - mysql

Route::post('/contactus','contactus_controller@store' );

public function store(Request $request)
{
  //dd($request->all());

  $this->validate($request ,
    [
      'fullname'  => 'required',
      'email' => 'required',
      'message' => 'required'
    ]
  );

  $usermessage = new Usermessage;
  $usermessage->fullname = $request->get('fullname');
  $usermessage->email = $request->get('email');
  $usermessage->message = $request->get('message');
  $usermessage->username = $request->session()->get('username_session');
  $usermessage->save();

  return 123;
}

add method="post" in your html form. <form method = 'POST' action = '{{url("contactus/store")}}' enctype="multipart/form-data">