Critical Error on default index.php script

I have tested the index.php script available into nano examples but at any request i receive an unhandled exception

[INFO] App started
[INFO] Worker#0 started.
[INFO] HTTP Server listening at 0.0.0.0:9501
[INFO] Process[nano-process.0] start.
[INFO] Process[crontab-dispatcher.0] start.
[INFO] nano-process Processing...
[INFO] nano-process Processing...
[INFO] execute every second!
[INFO] Crontab task [nano-crontab] executed successfully at 2024-10-21 09:58:00.
[INFO] nano-process Processing...
[INFO] execute every second!
[INFO] Crontab task [nano-crontab] executed successfully at 2024-10-21 09:58:01.
[CRITICAL] Hyperf\Di\Exception\InvalidArgumentException: The name parameter must be of type string, integer given in /home/dario/Projects/swoole/hyperf-nano/vendor/hyperf/di/src/Container.php:113
Stack trace:
#0 /home/dario/Projects/swoole/hyperf-nano/vendor/hyperf/exception-handler/src/ExceptionHandlerDispatcher.php(37): Hyperf\Di\Container->has()
#1 /home/dario/Projects/swoole/hyperf-nano/vendor/hyperf/http-server/src/Server.php(116): Hyperf\ExceptionHandler\ExceptionHandlerDispatcher->dispatch()
#2 /home/dario/Projects/swoole/hyperf-nano/vendor/hyperf/support/src/SafeCaller.php(61): Hyperf\HttpServer\Server->Hyperf\HttpServer\{closure}()
#3 /home/dario/Projects/swoole/hyperf-nano/vendor/hyperf/http-server/src/Server.php(115): Hyperf\Support\SafeCaller->call()
#4 [internal function]: Hyperf\HttpServer\Server->onRequest()
#5 {main}
[INFO] nano-process Processing...
[INFO] execute every second!
[INFO] Crontab task [nano-crontab] executed successfully at 2024-10-21 09:58:02.
[INFO] nano-process Processing...
[INFO] execute every second!
[INFO] Crontab task [nano-crontab] executed successfully at 2024-10-21 09:58:03.
[INFO] nano-process Processing...
[INFO] execute every second!
[INFO] Crontab task [nano-crontab] executed successfully at 2024-10-21 09:58:04.

Request is executed but this "CRITICAL error" is logged all the times.