I'm having troubles buying FedEx shipping label through EasyPost. I was trying to buy label for FedEx International Economy service and received the following error message from EasyPost:
Shipment: shp_XXX, message: Validation failed: Predefined package Invalid predefined package type.
I didn't set any predefined packages, maybe this is the problem and I must enter predefined package along with weight only?
Please help me out.
Thanks