Solved Underfined variable

Code
Underfined variable $this

PHP:

<?php

namespace HiggsInc\onevsone\model;

use pocketmine\scheduler\PluginTask;
use pocketmine\utils\TextFormat;


class SignRefreshTask extends PluginTask{
  
    /** var ArenaManager **/
    public $arenaManager;
  
    public function onRun(int $currentTick);
        $this->arenaManager->refreshSigns();
    }
  
}


 

I doubt that. the `arenaManager` property is uninitialized however, you don't initialize it in the constructor.

 

More importantly, your onRun function has a semicolon instead of the opening curly braces.