help with "Your model name is not a valid java name, custom mob model names can not contain whitespace"?

I am having issues with my Java Model, here is the code

// Made with Blockbench 3.5.0
// Exported for Minecraft version 1.12
// Paste this class into your mod and generate all required imports

public class ghastvilliger extends ModelBase {
    private final ModelRenderer i;
    private final ModelRenderer j;

    public ghastvilliger() {
        textureWidth = 256;
        textureHeight = 144;

        i = new ModelRenderer(this);
        i.setRotationPoint(27.0F, 74.0F, -17.0F);
        i.cubeList.add(new ModelBox(i, 0, 0, -59.0F, -129.0F, -15.0F, 64, 79, 64, 0.0F, false));
        i.cubeList.add(new ModelBox(i, 192, 0, -34.0F, -74.0F, -31.0F, 16, 30, 16, 0.0F, false));

        j = new ModelRenderer(this);
        j.setRotationPoint(0.0F, 0.0F, 12.0F);
        i.addChild(j);
        setRotationAngle(j, 25.0F, 0.0F, 0.0F);
        j.cubeList.add(new ModelBox(j, 208, 68, -18.0F, -45.8274F, 38.9712F, 12, 64, 12, 0.0F, false));
        j.cubeList.add(new ModelBox(j, 208, 68, -9.0F, -58.9286F, 10.8757F, 12, 64, 12, 0.0F, false));
        j.cubeList.add(new ModelBox(j, 208, 68, -38.0F, -53.8572F, 21.7514F, 12, 64, 12, 0.0F, false));
        j.cubeList.add(new ModelBox(j, 208, 68, -26.0F, -61.4643F, 5.4378F, 12, 64, 12, 0.0F, false));
        j.cubeList.add(new ModelBox(j, 208, 68, -53.0F, -46.25F, 38.0649F, 12, 64, 12, 0.0F, false));
        j.cubeList.add(new ModelBox(j, 208, 68, -53.0F, -62.7321F, 2.7189F, 12, 64, 12, 0.0F, false));
    }

    @Override
    public void render(Entity entity, float f, float f1, float f2, float f3, float f4, float f5) {
        i.render(f5);
        j.render(f5);
    }

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

could somebody help with this? (sorry for the bad name spelling [ghastvilliger], I tried everything I could)