Response could not be converted to string #219

Object of class App\\Http\\Responses\\Sample could not be converted to string at method transferToResponse in class Hypervel\\Http\\CoreMiddleware

protected function transferToResponse($response, ServerRequestInterface $request): ResponsePlusInterface
    {
        if ($response instanceof Renderable) {
            if ($response instanceof ViewInterface) {
                if ($this->container->get(ConfigInterface::class)->get('view.event.enable', false)) {
                    $this->container->get(EventDispatcherInterface::class)
                        ->dispatch(new ViewRendered($response));
                }
            }

            return $this->response()
                ->setHeader('Content-Type', $this->container->get(RenderInterface::class)->getContentType())
                ->setBody(new SwooleStream($response->render()));
        }

        // Additional code
        if ($response instanceof \Hypervel\Support\Contracts\Responsable) {
            $hypervelRequest = new \Hypervel\Http\Request($request);
            $psrResponse = $response->toResponse($hypervelRequest);
            return new ResponsePlusProxy($psrResponse);
        }

        if (is_string($response)) {
            return $this->response()->addHeader('content-type', 'text/plain')->setBody(new SwooleStream($response));
        }

        if ($response instanceof ResponseInterface) {
            return new ResponsePlusProxy($response);
        }

        if (is_array($response) || $response instanceof Arrayable) {
            return $this->response()
                ->addHeader('content-type', 'application/json')
                ->setBody(new SwooleStream(Json::encode($response)));
        }

        if ($response instanceof Jsonable) {
            return $this->response()
                ->addHeader('content-type', 'application/json')
                ->setBody(new SwooleStream((string) $response));
        }

        if ($this->response()->hasHeader('content-type')) {
            return $this->response()->setBody(new SwooleStream((string) $response));
        }

        return $this->response()
            ->addHeader('content-type', 'text/plain')
            ->setBody(new SwooleStream((string) $response));
    }

<?php

declare(strict_types=1);

namespace App\Http\Responses;

use Hypervel\Http\Request;
use Psr\Http\Message\ResponseInterface;
use Hypervel\Support\Contracts\Responsable;

class Sample implements Responsable
{
    public function toResponse(Request $request): ResponseInterface
    {
        return response()->json([
            'success' => true,
            'message' => 'Hello from Sample!',
        ]);
    }
}

/**
 * Display a listing of the resource.
 */
public function index()
{
    return app(Sample::class);
}