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Package weight exceeds the maximum limit. - LongMessage - Package weight is over the weight limit for service USPS First Class Mail Intl / First Class Package Intl Service. The maximum weight is 4 lbs.
When this error is returned it means that the total package is over 4 lbs. The 4 lbs being calculated includes Item Weight and Box Weight meaning if your item is 4 lbs but your box weight is 1 lbs then this error will be yielded. The solution is to change your shipping type or adjust the total weight of your package if it is indeed 4 lbs or under.