CustomEntityRenderer.java

====================
Replace this:
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public class CustomEntityRenderer extends HumanoidMobRenderer<CustomEntity, HumanoidModel<CustomEntity>> {
    public CustomEntityRenderer(EntityRendererProvider.Context context) {
        super(context, new HumanoidModel(context.bakeLayer(ModelLayers.PLAYER)), 0.5f);
        this.addLayer(new HumanoidArmorLayer(this, new HumanoidModel(context.bakeLayer(ModelLayers.PLAYER_INNER_ARMOR)), new HumanoidModel(context.bakeLayer(ModelLayers.PLAYER_OUTER_ARMOR)), context.getModelManager()));
    }

    @Override
    public ResourceLocation getTextureLocation(CustomEntity entity) {
        return new ResourceLocation("textures/entity/skeleton/skeleton.png");
    }
}


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With:
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public class CustomEntityRenderer extends HumanoidMobRenderer<CustomEntity, SkeletonModel<CustomEntity>> {
    private static final ResourceLocation SKELETON_LOCATION = new ResourceLocation("textures/entity/skeleton/skeleton.png");

    public CustomEntityRenderer(EntityRendererProvider.Context context) {
        this(context, ModelLayers.SKELETON, ModelLayers.SKELETON_INNER_ARMOR, ModelLayers.SKELETON_OUTER_ARMOR);
    }

    public CustomEntityRenderer(EntityRendererProvider.Context p_174382_, ModelLayerLocation p_174383_, ModelLayerLocation p_174384_, ModelLayerLocation p_174385_) {
        super(p_174382_, new SkeletonModel<>(p_174382_.bakeLayer(p_174383_)), 0.5F);
        this.addLayer(new HumanoidArmorLayer<>(this, new SkeletonModel(p_174382_.bakeLayer(p_174384_)), new SkeletonModel(p_174382_.bakeLayer(p_174385_)), p_174382_.getModelManager()));
    }

    @Override
    public ResourceLocation getTextureLocation(CustomEntity p_114482_) {
        return SKELETON_LOCATION;
    }



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IMPORTANT! Replace "modnamespace" with your modnamespace which is your mod id, lowercase. If you aren't sure, you can go to your Workspace settings.