Fatal error: Uncaught TypeError: Return value of Toolkit\Cli\App::doHandle() must be of the type int, null returned

[NoChizPlz]

the app runs but it gets error

Fatal error: Uncaught TypeError: Return value of Toolkit\Cli\App::doHandle() must be of the type int, null returned in C:\Users\Isaac Netero\PhpstormProjects\checker\vendor\toolkit\cli-utils\src\App.php:204
Stack trace:
#0 C:\Users\Isaac Netero\PhpstormProjects\checker\vendor\toolkit\cli-utils\src\App.php(171): Toolkit\Cli\App->doHandle()
#1 C:\Users\Isaac Netero\PhpstormProjects\checker\vendor\toolkit\cli-utils\src\App.php(138): Toolkit\Cli\App->dispatch(true)
#2 C:\Users\Isaac Netero\PhpstormProjects\checker\example\liteApp(69): Toolkit\Cli\App->run()
#3 {main}
  thrown in C:\Users\Isaac Netero\PhpstormProjects\checker\vendor\toolkit\cli-utils\src\App.php on line 204