help help my model doesn't work

what's wrong it doesn't work?

// Made with Blockbench 3.5.1
// Exported for Minecraft version 1.14
// Paste this class into your mod and generate all required imports

public class foo extends ModelBase {
    private final RendererModel body;
    private final RendererModel propellers;
    private final RendererModel lower;
    private final RendererModel upper;
    private final RendererModel head;

    public foo() {
        textureWidth = 128;
        textureHeight = 128;

        body = new RendererModel(this);
        body.setRotationPoint(0.0F, 24.0F, 0.0F);
        

        propellers = new RendererModel(this);
        propellers.setRotationPoint(0.0F, -9.0F, 0.0F);
        body.addChild(propellers);
        

        lower = new RendererModel(this);
        lower.setRotationPoint(0.0F, -1.0F, 0.0F);
        propellers.addChild(lower);
        lower.cubeList.add(new ModelBox(lower, 0, 24, -1.0F, -7.0F, -1.0F, 2, 7, 2, 0.0F, false));
        lower.cubeList.add(new ModelBox(lower, 36, 3, -8.0F, -1.0F, -1.0F, 16, 1, 2, 0.0F, false));
        lower.cubeList.add(new ModelBox(lower, 20, 25, -1.0F, -1.0F, -8.0F, 2, 1, 16, 0.0F, false));

        upper = new RendererModel(this);
        upper.setRotationPoint(0.0F, -1.0F, 0.0F);
        propellers.addChild(upper);
        upper.cubeList.add(new ModelBox(upper, 0, 0, -1.0F, -26.0F, -1.0F, 2, 7, 2, 0.0F, false));
        upper.cubeList.add(new ModelBox(upper, 36, 0, -8.0F, -26.0F, -1.0F, 16, 1, 2, 0.0F, false));
        upper.cubeList.add(new ModelBox(upper, 0, 24, -1.0F, -26.0F, -8.0F, 2, 1, 16, 0.0F, false));

        head = new RendererModel(this);
        head.setRotationPoint(0.0F, 0.0F, 0.0F);
        body.addChild(head);
        head.cubeList.add(new ModelBox(head, 0, 0, -6.0F, -29.0F, -6.0F, 12, 12, 12, 0.0F, false));
    }

    @Override
    public void render(Entity entity, float f, float f1, float f2, float f3, float f4, float f5) {
        body.render(f5);
        propellers.render(f5);
        lower.render(f5);
        upper.render(f5);
        head.render(f5);
    }

    public void setRotationAngle(RendererModel modelRenderer, float x, float y, float z) {
        modelRenderer.rotateAngleX = x;
        modelRenderer.rotateAngleY = y;
        modelRenderer.rotateAngleZ = z;
    }
}