Solved How to load a chunk ???

My code is that it spawn in random chords the problem is that chunks are not charging for spawn!

 

$yourworld->loadChunk($x,$z)

 

Error
Error: "Call to undefined method matrox\Main::getLevel()" (EXCEPTION) in "plugins/Core/src/matrox/Main" at line 1667

 

$level must instanceof \pocketmine\level\Level

 

Works thanks