Timer is not Working

I'm making a timer but it doesn't work. Why??

This is the error part "Undefined property: ring\rang::$Clock" (EXCEPTION)

PHP:

public function Clock(){

        $this->getServer()->broadcastTip("{$this->Clock}Second Left");

        $this->Clock--;

      }

and here is using task part of that

PHP:

class Count extends Task{

  public function __construct(rang $rang){

    $this->rang = $rang;

    $this->Clock = 300;

  }

  public function onRun(int $currentTick){

    $this->rang->Clock();

  }
}

 

You must add

PHP:

public $rang;

public $Clock;

to correct classes.

 

I did what you said but now it says error of what you said..
Where should I put that? and Why should I use that?

 

These are properties. You must add $rang, $Clock property to Clock.php and $Clock property to rang.php.

 

I don't have a Clock.php