I’m using TYPO3 13.1.1 and I delevoped a custom extension in order to display on the front-end side some stuff generated by one of my extension Controller.

-> My extension was installed via Composer, and is displayed in the Extension back-end tab.
-> For the moment, I just need to output a “Hello World!” via a plugin

What I see on the front-end : Error “Oops, an error occurred“

My ProductSpaceController.php:

<?php

namespace CompanyController;
use TYPO3CMSExtbaseMvcControllerActionController;

class ProductSpaceController extends ActionController
{
    public function testAction()
    {
        return 'Hello World';
    }
}

My ext_localconf.php:

<?php

declare(strict_types=1);

use MyCompanyControllerProductSpaceController;
use TYPO3CMSExtbaseUtilityExtensionUtility;

defined('TYPO3') or die('Access denied.');

ExtensionUtility::configurePlugin
(
    'company',
    'displaymatrice',
    [
        ProductSpaceController::class => 'test',
    ],
    [
        ProductSpaceController::class => 'test',
    ]
);

My Configuration/Services.yaml:

services:
  _defaults:
    autowire: true
    autoconfigure: true
    public: false

  Company:
    resource: '../Classes/*'

My typoscript:

lib.testoutput = USER_INT // I also tried COA, USER
lib.testoutput < tt_content.list.20.company_displaymatrice

When I try to display in fluid, I get the error:

<f:cObject typoscriptObjectPath="lib.testoutput" />

PS: I have other “lib.xxx” that already work (for my top menu, my footer menu, my breadcrumb, my lang switcher etc…)