"Controller ..CategoryController has required constructor arguments and does not exist in the container. Did you forget to define such a service?",

I'm having trouble with a custom controller with Symfony4 and API Platform.

{ "@context": "/api/contexts/Error", "@type": "hydra:Error",
"hydra:title": "An error occurred", "hydra:description": "Controller \"\App\Controller\CategoryController\" has required constructor arguments and does not exist in the container. Did you forget to define such a service?", "trace": [ { "namespace": "", "short_class": "", "class": "", "type": "", "function": "", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\vendor\symfony\http-kernel\Controller\ContainerControllerResolver.php", "line": 62, "args": [] }, { "namespace": "Symfony\Component\HttpKernel\Controller", "short_class": "ContainerControllerResolver", "class": "Symfony\Component\HttpKernel\Controller\ContainerControllerResolver", "type": "->", "function": "instantiateController", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\vendor\symfony\framework-bundle\Controller\ControllerResolver.php", "line": 54, "args": [ [ "string", "\App\Controller\CategoryController" ] ] }, { "namespace": "Symfony\Bundle\FrameworkBundle\Controller", "short_class": "ControllerResolver", "class": "Symfony\Bundle\FrameworkBundle\Controller\ControllerResolver", "type": "->", "function": "instantiateController", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\vendor\symfony\http-kernel\Controller\ControllerResolver.php", "line": 110, "args": [ [ "string", "\App\Controller\CategoryController" ] ] }, { "namespace": "Symfony\Component\HttpKernel\Controller", "short_class": "ControllerResolver", "class": "Symfony\Component\HttpKernel\Controller\ControllerResolver", "type": "->", "function": "createController", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\vendor\symfony\http-kernel\Controller\ContainerControllerResolver.php", "line": 42, "args": [ [ "string", "\App\Controller\CategoryController::show" ] ] }, { "namespace": "Symfony\Component\HttpKernel\Controller", "short_class": "ContainerControllerResolver", "class": "Symfony\Component\HttpKernel\Controller\ContainerControllerResolver", "type": "->", "function": "createController", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\vendor\symfony\framework-bundle\Controller\ControllerResolver.php", "line": 46, "args": [ [ "string", "\App\Controller\CategoryController::show" ] ] }, { "namespace": "Symfony\Bundle\FrameworkBundle\Controller", "short_class": "ControllerResolver", "class": "Symfony\Bundle\FrameworkBundle\Controller\ControllerResolver", "type": "->", "function": "createController", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\vendor\symfony\http-kernel\Controller\ControllerResolver.php", "line": 85, "args": [ [ "string", "\App\Controller\CategoryController::show" ] ] }, { "namespace": "Symfony\Component\HttpKernel\Controller", "short_class": "ControllerResolver", "class": "Symfony\Component\HttpKernel\Controller\ControllerResolver", "type": "->", "function": "getController", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\vendor\symfony\http-kernel\Controller\TraceableControllerResolver.php", "line": 38, "args": [ [ "object", "Symfony\Component\HttpFoundation\Request" ] ] }, { "namespace": "Symfony\Component\HttpKernel\Controller", "short_class": "TraceableControllerResolver", "class": "Symfony\Component\HttpKernel\Controller\TraceableControllerResolver", "type": "->", "function": "getController", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\vendor\symfony\http-kernel\HttpKernel.php", "line": 134, "args": [ [ "object", "Symfony\Component\HttpFoundation\Request" ] ] }, { "namespace": "Symfony\Component\HttpKernel", "short_class": "HttpKernel", "class": "Symfony\Component\HttpKernel\HttpKernel", "type": "->", "function": "handleRaw", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\vendor\symfony\http-kernel\HttpKernel.php", "line": 68, "args": [ [ "object", "Symfony\Component\HttpFoundation\Request" ], [ "integer", 1 ] ] }, { "namespace": "Symfony\Component\HttpKernel", "short_class": "HttpKernel", "class": "Symfony\Component\HttpKernel\HttpKernel", "type": "->", "function": "handle", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\vendor\symfony\http-kernel\Kernel.php", "line": 198, "args": [ [ "object", "Symfony\Component\HttpFoundation\Request" ], [ "integer", 1 ], [ "boolean", true ] ] }, { "namespace": "Symfony\Component\HttpKernel", "short_class": "Kernel", "class": "Symfony\Component\HttpKernel\Kernel", "type": "->", "function": "handle", "file": "C:\Users\Jonny\Desktop\Workspace\php\documentarywire\public\index.php", "line": 25, "args": [ [ "object", "Symfony\Component\HttpFoundation\Request" ] ] } ] }

.

<?php

namespace App\Controller;

use App\Entity\User;
use App\Service\CategoryService;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;

class CategoryController extends AbstractController
{
    /**
     * @var CategoryService
     */
    private $categoryService;

    /**
     * @param CategoryService $categoryService
     */
    public function __construct(CategoryService $categoryService)
    {
        $this->categoryService = $categoryService;
    }

    public function show($slug)
    {
        return $slug;
    }
}

I've tried adding the controller and service to services.yaml

# This file is the entry point to configure your own services.
# Files in the packages/ subdirectory configure your dependencies.

# Put parameters here that don't need to change on each machine where the app is deployed
# https://symfony.com/doc/current/best_practices/configuration.html#application-related-configuration
parameters:

services:
    # default configuration for services in *this* file
    _defaults:
        autowire: true      # Automatically injects dependencies in your services.
        autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.

    # makes classes in src/ available to be used as services
    # this creates a service per class whose id is the fully-qualified class name
    App\:
        resource: '../src/*'
        exclude: '../src/{DependencyInjection,Entity,Migrations,Tests,Kernel.php}'

    # controllers are imported separately to make sure services can be injected
    # as action arguments even if you don't extend any base controller class
    App\Controller\:
        resource: '../src/Controller'
        tags: ['controller.service_arguments']

    # add more service definitions when explicit configuration is needed
    # please note that last definitions always *replace* previous ones

    category_service:
        class: App\Service\CategoryService
        public: true

    App\Controller\CategoryController:
        arguments: ['@category_service']