PLEASE NOTE: eBay errors are common. If your item is showing "Failed to List" after attempting to list, you can learn more by clicking on the item receiving error to see what eBay is asking from your listing under 'eBay Status'.
You will need to add a line for the package weight to the "Product Details" section in the pop-up listing tool. For example: "Shipping Weight: 1.5 pounds" as shown in example below.
Push to list the item to eBay again.