Ошибка 405 POST http://127.0.0.1:8000/posts/& 405 (Method Not Allowed) Laravel ajax

 <form id="ajaxForm" onsubmit="return sendForm();">
                                    <textarea name="message"  class="textarea" rows="3"
                                              placeholder="Напишите свой комментарий"></textarea>
                                    <div class="mt-3">
                                        <button class="btn btn-primary comment-button" id="saveBtn">Comment</button>
                                    </div>
                                </form>

$(document).ready(function() {

        $('#saveBtn').click(function(e) {
            e.preventDefault();
            sendForm();
        });

        $.ajaxSetup({
            headers: {
                'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content')
            }
        });

        $('#saveBtn').html('Отправить');
        //Отправка на сервер данных
        $('.error-message').html();

        function sendForm() {
            var formI = $('#ajaxForm')[0];

            var form = new FormData(formI);

            $.ajax({
                url: '{{ url("/posts/' + slug + '/comments")}}',
                method: 'POST',
                processData: false,
                contentType: false,
                dataType: "json",
                data: {form},

                success: function(response) {
                    console.log(response.success)
                },
                error: function(xhr, status, error) {
                    console.log(error)
                    // if (error) {
                    //     console.log(error.responseJSON.errors.message)
                    //     $('#errorMessage').html(error.responseJSON.errors.message);
                    // }
                },
            });

            return false;
        }


    });

Route::group(['namespace' => 'Post', 'prefix' => 'posts'], function () {
    Route::get('/', [\App\Http\Controllers\Post\IndexController::class, 'index'])->name('post.index');
    Route::get('/{slug}', [\App\Http\Controllers\Post\ShowController::class, 'index'])->name('post.show');

    Route::group(['namespace' => 'Comment', 'prefix' => '{slug}/comments'], function (){
        Route::post('/', [\App\Http\Controllers\Post\Comment\StoreController::class, 'index'])->name('post.comment.store');
    });

});

 public function index(Post $post, StoreRequest $request)
    {

        $data = $request->validated();
        $data['user_id'] = auth()->user()->id;
        $data['commentable_id'] = $post->id;
        Comment::create($data);

    }