My JAVA model has an invalid name!

I tried to import a java model, and for some reason MCreator 2020.2 didn't accept it. The message that would follow would say that the name couldn't contain whitespace, start with a number, or include non-ASCII letters. I need help to fix this. Does anyone know what's wrong with the code?

Here's the code, by the way:

// Made with Blockbench 3.5.4
// Exported for Minecraft version 1.12
// Paste this class into your mod and generate all required imports

import org.lwjgl.opengl.GL11;
import net.minecraft.client.model.ModelBase;
import net.minecraft.client.model.ModelBox;
import net.minecraft.client.model.ModelRenderer;
import net.minecraft.client.renderer.GlStateManager;
import net.minecraft.entity.Entity;

public class ModelElderElfBoss3 extends ModelBase {
    private final ModelRenderer body;
    private final ModelRenderer legright;
    private final ModelRenderer legleft;
    private final ModelRenderer armright;
    private final ModelRenderer cane;
    private final ModelRenderer bone6;
    private final ModelRenderer bone7;
    private final ModelRenderer armleft;
    private final ModelRenderer head;
    private final ModelRenderer earright;
    private final ModelRenderer earleft;
    private final ModelRenderer nose;
    private final ModelRenderer bone3;
    private final ModelRenderer bone4;
    private final ModelRenderer bone5;
    private final ModelRenderer ringbase;
    private final ModelRenderer ring1;
    private final ModelRenderer ring2;
    private final ModelRenderer ring3;
    private final ModelRenderer ring4;
    private final ModelRenderer ringline1;
    private final ModelRenderer ringline2;
    private final ModelRenderer ringline3;
    private final ModelRenderer ringline4;

    public ModelElderElfBoss3() {
        textureWidth = 64;
        textureHeight = 64;

        body = new ModelRenderer(this);
        body.setRotationPoint(0.0F, 24.0F, 0.0F);
        body.cubeList.add(new ModelBox(body, 0, 0, -4.0F, -22.0F, -2.0F, 8, 12, 4, 0.0F, false));

        legright = new ModelRenderer(this);
        legright.setRotationPoint(-2.0F, 14.0F, 0.0F);
        setRotationAngle(legright, 0.2618F, 0.0F, 0.0F);
        legright.cubeList.add(new ModelBox(legright, 40, 0, -1.0F, 0.0F, -1.0F, 2, 8, 2, 0.0F, false));
        legright.cubeList.add(new ModelBox(legright, 20, 12, -1.0F, 8.0F, -3.0F, 2, 2, 4, 0.0F, false));

        legleft = new ModelRenderer(this);
        legleft.setRotationPoint(2.0F, 14.0F, 0.0F);
        setRotationAngle(legleft, 0.2618F, 0.0F, 0.0F);
        legleft.cubeList.add(new ModelBox(legleft, 32, 0, -1.0F, 0.0F, -1.0F, 2, 8, 2, 0.0F, false));
        legleft.cubeList.add(new ModelBox(legleft, 48, 12, -1.0F, 8.0F, -3.0F, 2, 2, 4, 0.0F, false));

        armright = new ModelRenderer(this);
        armright.setRotationPoint(-4.0F, 3.0F, 0.0F);
        setRotationAngle(armright, -0.6981F, 0.1745F, 0.4363F);
        armright.cubeList.add(new ModelBox(armright, 24, 0, -2.0F, 0.0F, -1.0F, 2, 10, 2, 0.0F, false));

        cane = new ModelRenderer(this);
        cane.setRotationPoint(0.0F, 0.0F, 0.0F);
        armright.addChild(cane);
        cane.cubeList.add(new ModelBox(cane, 48, 12, -1.5F, 8.0F, -6.0F, 1, 1, 5, 0.0F, false));
        cane.cubeList.add(new ModelBox(cane, 50, 12, -1.5F, 6.0F, -12.5F, 1, 1, 4, 0.0F, false));
        cane.cubeList.add(new ModelBox(cane, 50, 12, -1.5F, 14.0F, -11.5F, 1, 1, 4, 0.0F, false));
        cane.cubeList.add(new ModelBox(cane, 52, 12, -1.5F, 9.0F, -14.7F, 1, 4, 1, 0.0F, false));
        cane.cubeList.add(new ModelBox(cane, 0, 19, -2.0F, 13.5F, -8.0F, 2, 2, 2, 0.0F, false));
        cane.cubeList.add(new ModelBox(cane, 48, 12, -1.5F, 8.0F, 1.0F, 1, 1, 5, 0.0F, false));
        cane.cubeList.add(new ModelBox(cane, 20, 12, -1.5F, 8.0F, 6.0F, 1, 1, 5, 0.0F, true));

        bone6 = new ModelRenderer(this);
        bone6.setRotationPoint(0.0F, 9.0F, -6.0F);
        cane.addChild(bone6);
        setRotationAngle(bone6, -0.6109F, 0.0F, 0.0F);
        bone6.cubeList.add(new ModelBox(bone6, 48, 12, -1.5F, -1.0F, -4.0F, 1, 1, 4, 0.0F, true));
        bone6.cubeList.add(new ModelBox(bone6, 48, 12, -1.5F, 7.0F, -5.0F, 1, 1, 4, 0.0F, true));

        bone7 = new ModelRenderer(this);
        bone7.setRotationPoint(0.0F, 6.0F, -12.0F);
        armright.addChild(bone7);
        setRotationAngle(bone7, 0.8727F, 0.0F, 0.0F);
        bone7.cubeList.add(new ModelBox(bone7, 48, 12, -1.5F, -0.2F, -4.0F, 1, 1, 4, 0.0F, true));

        armleft = new ModelRenderer(this);
        armleft.setRotationPoint(4.0F, 3.0F, 0.0F);
        setRotationAngle(armleft, -0.5236F, -0.1745F, -0.4363F);
        armleft.cubeList.add(new ModelBox(armleft, 48, 0, 0.0F, 0.0F, -1.0F, 2, 10, 2, 0.0F, false));

        head = new ModelRenderer(this);
        head.setRotationPoint(0.0F, 2.0F, 0.0F);
        head.cubeList.add(new ModelBox(head, 24, 10, -4.0F, -8.0F, -4.0F, 8, 8, 8, 0.0F, false));
        head.cubeList.add(new ModelBox(head, 0, 26, -5.0F, -10.0F, -5.0F, 10, 2, 10, 0.0F, false));
        head.cubeList.add(new ModelBox(head, 16, 38, -3.0F, -3.0F, -4.1F, 6, 8, 1, 0.0F, false));

        earright = new ModelRenderer(this);
        earright.setRotationPoint(0.0F, 22.0F, 0.0F);
        head.addChild(earright);
        setRotationAngle(earright, 0.0F, 0.1745F, 0.0F);
        earright.cubeList.add(new ModelBox(earright, 16, 18, -7.0F, -27.0F, -1.0F, 3, 3, 1, 0.0F, false));

        earleft = new ModelRenderer(this);
        earleft.setRotationPoint(0.0F, 22.0F, 0.0F);
        head.addChild(earleft);
        setRotationAngle(earleft, 0.0F, -0.1745F, 0.0F);
        earleft.cubeList.add(new ModelBox(earleft, 8, 16, 4.0F, -27.0F, 0.0F, 3, 3, 1, 0.0F, false));

        nose = new ModelRenderer(this);
        nose.setRotationPoint(0.0F, 0.0F, 0.0F);
        head.addChild(nose);
        setRotationAngle(nose, 0.4363F, 0.0F, 0.0F);
        nose.cubeList.add(new ModelBox(nose, 0, 16, -1.0F, -5.5F, -4.0F, 2, 1, 2, 0.0F, false));

        bone3 = new ModelRenderer(this);
        bone3.setRotationPoint(0.0F, 0.0F, 1.0F);
        head.addChild(bone3);
        setRotationAngle(bone3, -0.4363F, 0.0F, 0.0F);
        bone3.cubeList.add(new ModelBox(bone3, 34, 32, -3.0F, -12.0F, -8.0F, 6, 5, 6, 0.0F, false));

        bone4 = new ModelRenderer(this);
        bone4.setRotationPoint(0.0F, 0.0F, 1.0F);
        bone3.addChild(bone4);
        setRotationAngle(bone4, -0.2618F, 0.0F, 0.0F);
        bone4.cubeList.add(new ModelBox(bone4, 0, 38, -2.0F, -14.0F, -11.0F, 4, 5, 4, 0.0F, false));

        bone5 = new ModelRenderer(this);
        bone5.setRotationPoint(0.0F, 0.0F, 0.0F);
        bone4.addChild(bone5);
        setRotationAngle(bone5, -0.0873F, 0.0F, 0.0F);
        bone5.cubeList.add(new ModelBox(bone5, 0, 19, -1.0F, -15.0F, -11.0F, 2, 2, 2, 0.0F, false));

        ringbase = new ModelRenderer(this);
        ringbase.setRotationPoint(0.0F, 2.0F, 9.25F);
        

        ring1 = new ModelRenderer(this);
        ring1.setRotationPoint(0.0F, 0.0F, 0.0F);
        ringbase.addChild(ring1);
        ring1.cubeList.add(new ModelBox(ring1, 0, 23, -2.5F, -16.0F, -0.25F, 5, 5, 0, 0.0F, false));
        ring1.cubeList.add(new ModelBox(ring1, 0, 47, -3.5F, -2.5F, 0.0F, 7, 5, 0, 0.0F, false));

        ring2 = new ModelRenderer(this);
        ring2.setRotationPoint(0.0F, 0.0F, 0.0F);
        ringbase.addChild(ring2);
        setRotationAngle(ring2, 0.0F, 0.0F, 1.5708F);
        ring2.cubeList.add(new ModelBox(ring2, 0, 28, -2.5F, -16.0F, -0.25F, 5, 5, 0, 0.0F, false));

        ring3 = new ModelRenderer(this);
        ring3.setRotationPoint(0.0F, 0.0F, 0.0F);
        ringbase.addChild(ring3);
        setRotationAngle(ring3, 0.0F, 0.0F, -3.1416F);
        ring3.cubeList.add(new ModelBox(ring3, 0, 23, -2.5F, -16.0F, -0.25F, 5, 5, 0, 0.0F, false));

        ring4 = new ModelRenderer(this);
        ring4.setRotationPoint(0.0F, 0.0F, 0.0F);
        ringbase.addChild(ring4);
        setRotationAngle(ring4, 0.0F, 0.0F, -1.5708F);
        ring4.cubeList.add(new ModelBox(ring4, 0, 28, -2.5F, -16.0F, -0.25F, 5, 5, 0, 0.0F, false));

        ringline1 = new ModelRenderer(this);
        ringline1.setRotationPoint(-0.5F, 0.0F, -0.25F);
        ringbase.addChild(ringline1);
        setRotationAngle(ringline1, 0.0F, 0.0F, 0.7854F);
        ringline1.cubeList.add(new ModelBox(ringline1, 0, 47, -4.0F, -16.0F, 0.0F, 7, 5, 0, 0.0F, false));

        ringline2 = new ModelRenderer(this);
        ringline2.setRotationPoint(-0.5F, 0.0F, -0.25F);
        ringbase.addChild(ringline2);
        setRotationAngle(ringline2, 0.0F, 0.0F, 2.3562F);
        ringline2.cubeList.add(new ModelBox(ringline2, 0, 47, -4.0F, -16.0F, 0.0F, 7, 5, 0, 0.0F, false));

        ringline3 = new ModelRenderer(this);
        ringline3.setRotationPoint(-0.5F, 0.0F, -0.25F);
        ringbase.addChild(ringline3);
        setRotationAngle(ringline3, 0.0F, 0.0F, -2.3562F);
        ringline3.cubeList.add(new ModelBox(ringline3, 0, 47, -4.0F, -16.0F, 0.0F, 7, 5, 0, 0.0F, false));

        ringline4 = new ModelRenderer(this);
        ringline4.setRotationPoint(-0.5F, 0.0F, -0.25F);
        ringbase.addChild(ringline4);
        setRotationAngle(ringline4, 0.0F, 0.0F, -0.7854F);
        ringline4.cubeList.add(new ModelBox(ringline4, 0, 47, -4.0F, -16.0F, 0.0F, 7, 5, 0, 0.0F, false));
    }

    @Override
    public void render(Entity entity, float f, float f1, float f2, float f3, float f4, float f5) {
        body.render(f5);
        legright.render(f5);
        legleft.render(f5);
        armright.render(f5);
        armleft.render(f5);
        head.render(f5);
        ringbase.render(f5);
    }

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

Help would be appreciated! =)