Plugin Task errors

Why are there such less task errors? i was using an undeclared function in plugin task and i didnt even knew until i saw, it gave me no errors in console :/

 

What plugin task was that? What was the function?

 

scheduleDelayedRepeatingTask

 

There has been changed nothing to PluginTasks lately. Have you even scheduled the task correctly?

 

PHP:

 $this->getServer()->getScheduler()->scheduleDelayedRepeatingTask(new CoolDownTask($this), 1200, 1200);

PHP:

class CoolDownTask extends PluginTask{

    private $plugin;

    public function __construct(Main $plugin){
        parent::__construct($plugin);
        $this->plugin = $plugin;
    }

    public function onRun($tick){
            $this->plugin->processCoolDown();
    }

}