The error (Ship Web Service Error Message: An exception has been raised as a result of client data. InnerMessage:Hard128039Invalid number of products) from UPS typically occurs when the order contains an invalid number of products.
To resolve this issue, review the steps below:
Check the number of products on your order.
Ensure the order contains between 1 and 50 products.
Remove any products that exceed the 50-product limit.
By following these steps, you should be able to resolve the error.