Customize the label

Notice: Undefined index: product_id in /home/bowtie8/public_html/wp-content/plugins/woocommerce-product-designer/public/class-wpd-public.php on line 466
Error: Invalid product:
1- Is your customization page defined as homepage?
2- Is your customization page defined as one of woocommerce pages?
3- Does the product you are trying to customize exists and is published in your shop?
4- Are you accessing this page from one of the product designer buttons?