This is the detailed error message I get:
<?xml version="1.0" encoding="UTF-8"?>
<RatingServiceSelectionRequest xml:lang="en-US">
<Request>
<TransactionReference>
<CustomerContext>Complex Rate Request</CustomerContext>
<XpciVersion>1.0001</XpciVersion>
</TransactionReference>
<RequestAction>Rate</RequestAction>
<RequestOption>rate</RequestOption>
</Request>
<PickupType>
<Code>06</Code>
</PickupType>
<Shipment>
<Shipper>
<ShipperNumber>XXXXX</ShipperNumber>
<Address>
<City>Beltsville</City>
<StateProvinceCode>MD</StateProvinceCode>
<PostalCode>20705</PostalCode>
<CountryCode>US</CountryCode>
</Address>
</Shipper>
<ShipTo>
<Address>
<StateProvinceCode></StateProvinceCode>
<PostalCode>20001</PostalCode>
<CountryCode>US</CountryCode>
</Address>
</ShipTo>
<ShipFrom>
<Address>
<StateProvinceCode>MD</StateProvinceCode>
<PostalCode>20705</PostalCode>
<CountryCode>US</CountryCode>
</Address>
</ShipFrom>
<ShipmentWeight>
<UnitOfMeasurement>
<Code>LBS</Code>
</UnitOfMeasurement>
<Weight>20</Weight>
</ShipmentWeight>
<Service>
<Code>03</Code>
<Description>UPS Ground</Description>
</Service>
<Package><PackagingType><Code>25</Code></PackagingType><PackageWeight><UnitOfMeasurement><Code>LBS</Code><Description>Pounds</Description></UnitOfMeasurement><Weight>20</Weight></PackageWeight><PackageServiceOptions><InsuredValue><CurrencyCode>USD</CurrencyCode><MonetaryValue>99.99</MonetaryValue></InsuredValue></PackageServiceOptions></Package></Shipment>
</RatingServiceSelectionRequest> 
Joined: 10/30/2007