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This article applies to: ML v7, ML8, MultiStore

Input String Was Not in a Correct Format

Symptoms
Customers receive an "Input string was not in a correct format" error when clicking "Continue Checkout" on the shopping cart page (attempting to load checkoutshipping.aspx).

Cause
This can be caused by having a blank ShippingMethodIDIfFreeShippingIsOn AppConfig if the order qualifies for free shipping.