Need help with biome specific colors, custom code.

This is the code I came up with, along with help from another website.

It doesn't work. Does anyone know how to fix this?

Code;

package net.mcreator.weirdostuff;

import net.minecraftforge.fml.event.server.FMLServerStartingEvent;
import net.minecraftforge.fml.event.lifecycle.FMLCommonSetupEvent;
import java.util.List;
import java.util.Random;

import net.minecraft.block.state.IBlockstate;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.color.IBlockColor;
import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.util.math.AxisAlignedBB;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.IBlockAccess;
import net.minecraftforge.fml.relauncher.Side;
import net.minecraftforge.fml.relauncher.SideOnly;

@SideOnly(Side.CLIENT)
public class ModBlockColors implements IBlockColor
{
    public static final IBlockColor INSTANCE = new ModBlockColors();
    public static Random rand = new Random();
    {
        List<EntityPlayer> players = Minecraft.getMinecraft().world.getEntitiesWithinAABB(EntityPlayer.class, new AxisAlignedBB(pos.add(-3, 1, -3), pos.add(3, 2, 3)));
        if (!players.isEmpty())
    {
        return 0xC2EDFF
    }
    else
    {
        return 0xFFFFFF
    }
    public static void registerBlockColors()
    {
        Minecraft.getMinecraft().getBlockColors().registerBlockColorHandler(INSANCE, ModBlocks.deadleaves);
    }
}

@WeirdoStuffElements.ModElement.Tag
public class BiomeColors extends WeirdoStuffElements.ModElement {
    /**
     * Do not remove this constructor
     */
    public BiomeColors(WeirdoStuffElements instance) {
        super(instance, 179);
    }

    @Override
    public void initElements() {
    }

    @Override
    public void init(FMLCommonSetupEvent event) {
    }

    @Override
    public void serverLoad(FMLServerStartingEvent event) {
    }
}