Cake console shell is not working in cakephp 2.8

I am having trouble using cake’s console shell. I created a file HelloShell in \app\Console\Command folder

<?php class HelloShell extends AppShell { public function main() { $this->out('Hello world.'); } } When I run it from app\Console folder. I get error "Plugin Hello could not be found". Any help will be appreciated. Thanks in advance. ![image|687x271](upload://pCBfyL49vQudgtIYlmRMwdbWfOr.png)