My opencart is 1.5.5.1 and here is the error message from error log:
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2016-07-29 10:28:45 - USPS DATA SENT: API=RateV4&XML=<RateV4Request USERID="416SUNNY3894"> <Package ID="1"> <Service>ONLINE</Service> <ZipOrigination>60449</ZipOrigination> <ZipDestination>90001</ZipDestination> <Pounds>3</Pounds> <Ounces>14.4</Ounces> <Container>VARIABLE</Container> <Size>REGULAR</Size> <Width>7</Width> <Length>10</Length> <Height>5</Height> <Girth>34</Girth> <Machinable>false</Machinable> <ShipDate>29-Jul-2016</ShipDate> </Package></RateV4Request>
2016-07-29 10:28:45 - USPS DATA RECV: <?xml version="1.0" encoding="UTF-8"?>
<RateV4Response><Package ID="1"><ZipOrigination>60449</ZipOrigination><ZipDestination>90001</ZipDestination><Pounds>3</Pounds><Ounces>14.4</Ounces><Size>REGULAR</Size><Machinable>FALSE</Machinable><Zone>7</Zone><Postage CLASSID="3"><MailService>Priority Mail Express™</MailService><Rate>50.40</Rate><CommercialRate>45.36</CommercialRate><CommitmentDate>2016-07-30</CommitmentDate><CommitmentName>1-Day</CommitmentName></Postage><Postage CLASSID="2"><MailService>Priority Mail Express™ Hold For Pickup</MailService><Rate>50.40</Rate><CommercialRate>45.36</CommercialRate><CommitmentDate>2016-07-30</CommitmentDate><CommitmentName>1-Day</CommitmentName></Postage><Postage CLASSID="1"><MailService>Priority Mail™</MailService><Rate>18.00</Rate><CommercialRate>15.14</CommercialRate><CommitmentDate>2016-08-01</CommitmentDate><CommitmentName>2-Day</CommitmentName></Postage><Postage CLASSID="33"><MailService>Priority Mail™ Hold For Pickup</MailService><Rate>0.00</Rate><CommercialRate>15.14</CommercialRate><CommitmentDate>2016-08-01</CommitmentDate><CommitmentName>2-Day</CommitmentName></Postage><Postage CLASSID="22"><MailService>Priority Mail™ Large Flat Rate Box</MailService><Rate>18.75</Rate><CommercialRate>16.35</CommercialRate><CommitmentDate>2016-08-01</CommitmentDate><CommitmentName>2-Day</CommitmentName></Postage><Postage CLASSID="34"><MailService>Priority Mail™ Large Flat Rate Box Hold For Pickup</MailService><Rate>0.00</Rate><CommercialRate>16.35</CommercialRate><CommitmentDate>2016-08-01</CommitmentDate><CommitmentName>2-Day</CommitmentName></Postage><Postage CLASSID="17"><MailService>Priority Mail™ Medium Flat Rate Box</MailService><Rate>13.45</Rate><CommercialRate>11.95</CommercialRate><CommitmentDate>2016-08-01</CommitmentDate><CommitmentName>2-Day</CommitmentName></Postage><Postage CLASSID="35"><MailService>Priority Mail™ Medium Flat Rate Box Hold For Pickup</MailService><Rate>0.00</Rate><CommercialRate>11.95</CommercialRate><CommitmentDate>2016-08-01</CommitmentDate><CommitmentName>2-Day</CommitmentName></Postage><Postage CLASSID="49"><MailService>Priority Mail™ Regional Rate Box B</MailService><Rate>0.00</Rate><CommercialRate>15.14</CommercialRate><CommitmentDate>2016-08-01</CommitmentDate><CommitmentName>2-Day</CommitmentName></Postage><Postage CLASSID="50"><MailService>Priority Mail™ Regional Rate Box B Hold For Pickup</MailService><Rate>0.00</Rate><CommercialRate>15.14</CommercialRate><CommitmentDate>2016-08-01</CommitmentDate><CommitmentName>2-Day</CommitmentName></Postage><Postage CLASSID="6"><MailService>Media Mail Parcel</MailService><Rate>4.05</Rate></Postage><Postage CLASSID="7"><MailService>Library Mail Parcel</MailService><Rate>3.86</Rate></Postage></Package></RateV4Response>