addParticle() - Class Not Found - Task

Hello, I shall want to add particle on Keep2 but my task does not want to run.

keepgame.php

PHP:

public function onEnable() {
    $this->getServer()->getPluginManager()->registerEvents($this, $this);
    
    $task = new keepgametask($this);
    $this->getServer()->getScheduler()->scheduleRepeatingTask($task, 1);
    
    
    }

keepgametask.php

PHP:

public function onRun($tick) {
                
$this->plugin = $this->getOwner();
$keepmap = $this->plugin->getServer()->getLevelByName("Keep2");



$keepmap->addParticle(new FlameParticle(new Vector3(250, 33, 243)));  // It's the line 35
                
            
}

Error

I does not understand this error because I used the class " pocketmine\level\particle" in both files.
Sorry for my English, I'm French.

 

You have forget to use pocketmine\level\particle\FlameParticle, so plugin is trying to find that file in namespace of keepgamestask.php

 

Thank you for your help @Kyd !
Everything works now !