error

hello there is something wrong with this code. but I'm not sure what it is. the console keeps saying that something is wrong with this bottom line:

public function populateChunk($chunkX, $chunkZ) {
for ($x = 0; $x < 16; $x++) {
for ($z = 0; $z < 16; $z++) {
$this->level->getChunk($chunkX, $chunkZ)->setBiomeColor($x, $z, 133, 188, 86);

something is wrong with $this->level->getChunk($chunkX, $chunkZ)->setBiomeColor($x, $z, 133, 188, 86); and idk what it is. please help

 

yeah. do you know what's wrong with that line?

 

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[PHP]Your Code[/PHP]