Best Program For Making Models For Custom Mobs?

Can you put an image of the model you made, the name of the model, and the error it gave you? If so i might be able to help, cause it works fine for me

When you make a new modded mob you have to put in a geometry name, to fix a already created mob, open the java file type in the mob name in the spaces with <*>

//Made with Blockbench
//Paste this code into your mod.

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 <*> extends ModelBase {
    private final ModelRenderer bone;

    public <*>() {
        textureWidth = 16;
        textureHeight = 16;

        bone = new ModelRenderer(this);
        bone.setRotationPoint(0.0F, 24.0F, 0.0F);
        bone.cubeList.add(new ModelBox(bone, 0, 0, -1.0F, -2.0F, -1.0F, 2, 2, 2, 0.0F, false));
    }

    @Override
    public void render(Entity entity, float f, float f1, float f2, float f3, float f4, float f5) {
        bone.render(f5);
    }
    public void setRotationAngle(ModelRenderer modelRenderer, float x, float y, float z) {
        modelRenderer.rotateAngleX = x;
        modelRenderer.rotateAngleY = y;
        modelRenderer.rotateAngleZ = z;
    }
}

hope this helps