Laravel - call to a member function store() on null

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PHP

every time occur this error even we have set the enctype="multipart/form-data"

Someone, Please help me to resolve this issue.
we are posting our form and controller below.
Please help me to resolve

====Form ==========

<form method="request" action="pupload"  enctype="multipart/form-data">
   @csrf
   <input type="file" name="userfile" id="userfile"  class="form-control">
   <br>
   <button type="submit" class="btn btn-primary">Submit</button>
 </form>

======controller =====

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

class PracticeController extends Controller
{
    function index(){
		return view('form');
	}
	
	function upload(Request $request){
		$path=$request->file('userfile')->store('public');
		if($path){
            return "file uploaded successfully";
        }
	}
}

===Route===

<?php

use Illuminate\Support\Facades\Route;
use App\Http\Controllers\PracticeController;

/*
|--------------------------------------------------------------------------
| 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!
|
*/

Route::get('/', function () {
    return view('welcome');
});

Route::get('practice',[PracticeController::class,'index']);

Route::get('pupload',[PracticeController::class,'upload']);

What I have tried:

Someone , Please help me to resolve this error.
I'll be very thankfull for this kind act