Problem

I have tried printing a UPS shipping label and am seeing an error returned:

128039: Invalid number of products

Solution

According to the UPS API documentation, products per package are limited. You can only have a maximum of 50 items in one package.

To fix this issue, you must use the Split Packaging method to distribute items into several packages.

If the error message will still be the same, feel free to contact Linnworks Technical Support!