Creating a Skyblock Island generator, setBlock() wont work as it should be!

everything works fine except for the setBlock()'s, here is my code:

PHP:

public function generateIsland(Player $player) {
    $name = $player->getName();
    $this->getServer()->loadLevel($name);
    if($this->getServer()->getLevelByName($name) instanceof Level) {
        $player->sendMessage(TF::BOLD . TF::GRAY . "[" . TF::GOLD . "ML" . TF::WHITE . "BE" . TF::GRAY . "]" . TF::RESET .  TF::RED . " You already made an Island!");
        return;
    }
    $this->getServer()->generateLevel($name, null, "pocketmine\level\generator\Flat", ["preset" => "2;0;1"]);
    $level = $this->getServer()->getLevelByName($name);
    $grass = Block::get(2);
    $dirt = Block::get(3);
    $stone = Block::get(1);
    
    for($x = 251; $x <= 261; $x++) {
        $z = 251;
        while($z <= 261) {
            $level->setBlock(new Vector3($x, 60, $z), $grass);
            $level->setBlock(new Vector3($x, 59, $z), $dirt);
            $level->setBlock(new Vector3($x, 58, $z), $dirt);
            $level->setBlock(new Vector3($x, 58, $z), $dirt);
            $level->setBlock(new Vector3($x, 57, $z), $stone);
            $z++;
        }
    }
    $player->sendMessage(TF::BOLD . TF::GRAY . "[" . TF::GOLD . "ML" . TF::WHITE . "BE" . TF::GRAY . "]" . TF::RESET . " Your island has been made!");
}


 

Be sure that the chunks are loaded before you setBlock

 

ow well, how would I do that?

 

Level->loadChunk($x, $z)

 

ok thx imma try that

 

now im having errors:

Code:

[Server thread/CRITICAL]: Error: "Call to a member function loadChunk() on null" (EXCEPTION) in "plugins/MLBESkyblock/src/mlbe/skyblock/Core" at line 49

I just put the code you gave me here:

PHP:

for($x = 251; $x <= 261; $x++) {
    $z = 251;
    while($z <= 261) {
        $level->loadChunk($x, $z);
        $level->setBlock(new Vector3($x, 60, $z), $grass);
        $level->setBlock(new Vector3($x, 59, $z), $dirt);
        $level->setBlock(new Vector3($x, 58, $z), $dirt);
        $level->setBlock(new Vector3($x, 58, $z), $dirt);
        $level->setBlock(new Vector3($x, 57, $z), $stone);
        $z++;
    }
}


 

$level is a null variable getLevelByName probably returned null

 

wut if there isnt any block to load? how will I put blocks?