Method Not Allowed Http Exception laravel 5.4

Getting error in laravel simple controller class with following code

MethodNotAllowedHttpException

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use DB;
use app\Http\Requests;
use Illuminate\Support\Facades\Auth;


class ProfileController extends Controller
{


    private $userId;

    public function __construct()
    {
         $this->userId = Auth::id();    
    }

}

Route:

Route::post('user_profile','ProfileController@insert');

Calling by: <form action="/user_profile" method="post">

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