我一直有这个错误，不管我做什么。
这是web.php页面。我试图创建一个可以添加产品的表单，当我尝试添加一个项目时，它会显示给我这个。我是laravel的新手，对此没有任何线索

Route::group(['middleware' => 'admin.auth'],function(){

        // Categories Routes
        Route::get('/categories/create',[CategoryController::class,'create'])->name('categories.create');
        Route::post('/categories',[CategoryController::class,'store'])->name('categories.store');

        
    });

字符串
CategoryController.php

class CategoryController extends Controller
{
    public function index() {

    }

    public function create() {
        return view('admin.category.create');
    }

    public function store(Request $request) {
        $validator =Validator::make($request->all(),[
            'name' => 'required',
            'slug' =>'required|unique:categories',
        ]);

        if ($validator->passes()) {
            
            $category = new Category();
            $category->name = $request->name;
            $category->slug = $request->slug;
            $category->status = $request->status;
            $category->save();

            return response()->json([
                'status' => true,
                'message' => 'Category Added Successfully'
            ]);

            $request->session()->flash('success','Category Added Successfully');

        } else {
            return response()->json([
                'status' => false,
                'errors' => $validator->error()
            ]);
        }
    }
}

型
用于在表格刀片内输入产品名称和slug的按钮

$.ajax({
        url: '{{ route("categories.store") }}',
        type: 'post',
        data: element.serializeArray(),
        dataType: 'json',
        success: function(response){

            if (response["status"] == true) {

                $("#name").removeClasss('is-invalid')
                    .siblings('p')
                    .removeClass('invalid-feedback').html("");
                
                $("#slug").removeClasss('is-invalid')
                .siblings('p')
                .removeClass('invalid-feedback').html("");
                
            } else {
                var errors = response['errors'];
                if (errors['name']) {
                    $("#name").addClasss('is-invalid')
                    .siblings('p')
                    .addClass('invalid-feedback').html(errors['name']);
                } else {
                    $("#name").removeClasss('is-invalid')
                    .siblings('p')
                    .removeClass('invalid-feedback').html("");
                }
                
                if (errors['slug']) {
                    $("#slug").addClasss('is-invalid')
                    .siblings('p')
                    .addClass('invalid-feedback').html(errors['slug']);
                } else {
                    $("#slug").removeClasss('is-invalid')
                    .siblings('p')
                    .removeClass('invalid-feedback').html("");
                }
            }

        }, error: function(jqXHR, exception){
            console.log("Something went wrong");
        }
    })

型