Class not found?

Hey, i have created another class dir to store my tasks in my plugin, but i get this error...

Code:

Could not pass event 'pocketmine\event\player\PlayerJoinEvent' to 'cosmicWelcome v3.1': Class 'cosmicWelcome\tasks\Title' not found on cosmicWelcome\Main

Error: "Class 'cosmicWelcome\tasks\Title' not found" (EXCEPTION) in "__cosmicWelcome/src/cosmicWelcome/Main" at line 66

but i have wrote this at the beginning of the main

PHP:

use cosmicWelcome\tasks\Title;


and my Title Class contains:

PHP:

<?php
namespace cosmicWelcome;

use pocketmine\Player;
use pocketmine\scheduler\Task;
use pocketmine\utils\Config;


class Title extends Task{
    public $player;

    public function __construct($plugin, Player $player){
        $this->plugin = $plugin;
        $this->player = $player;
    }

    public function onRun($currentTick){
        $config = new Config($this->plugin->getDataFolder() . "config.yml", Config::YAML);

        $player = $this->player;

        $title = $this->plugin->replaceParameters($player, $config->get("title"));
        $subtitle = $this->plugin->replaceParameters($player, $config->get("subtitle"));

        $fadein = $config->get("fadein");
        $stay = $config->get("stay");
        $fadeout = $config->get("fadeout");
           
        $player->addTitle($title, $subtitle, $fadein, $stay, $fadeout);
               
       
    }   
}


and i call the task at line 66 (seen though the error)

PHP:

$this->getScheduler()->scheduleDelayedTask(new Title($this, $player), 40);


 

PHP:

<?php
namespace cosmicWelcome\tasks;