I can't set sign text

PHP:

public function onPlaceEvent(BlockPlaceEvent $event){
    $block = $event->getBlock();

    if($block->getId() != 63 and $block->getId() != 323) return;
    $tile = $block->getLevel()->getTile($block);
    if(!($tile instanceof Sign))
    {
        $this->getLogger()->info('tile is not instance of Sign');
        return;
    }
          
    $tile->setText('123');
}

Here's my code, when I place a sign, the console says 'tile is not instance of Sign', I just don't understand why is it not working, someone help please?

 

Make very sure that you add the use statement: pocketmine\tile\Sign
And not: pocketmine\item\Sign