I checked into the error
the error message actually contains the correct shipping calculation (minus the +1 lb for shipping materials) in this example here's the breakdown...
error= "974049740240REGULAR1Priority Mail6.10"
<starting zipcode '97404'><destination zipcode '97402'> <pounds '4'> <ounces '0'><package type 'regular'><classID + mailclass '1' + 'priority mail'><retail rate '6.10'>
so, why is it returning the value as an error? and how do I get it to reflect my +1lb shipping rule?