UPS shipping rates API error code 9368785

Question

As per the UPS shipping API (API examples given on the UPS developer resources page https://www.ups.com/gec/techdocs/pdf/Rates_Pkg_Gnd.zip) I am getting the error: Please contact UPS Freight Customer Service for Rates at 800-333-7400 (Error Code 9368785)

Below is the response that I am getting.

    [detail] => stdClass Object
        (
            [Errors] => stdClass Object
                (
                    [ErrorDetail] => stdClass Object
                        (
                            [Severity] => Hard
                            [PrimaryErrorCode] => stdClass Object
                                (
                                    [Code] => 9368785
                                    [Description] => Please contact UPS Freight Customer Service  for Rates at 800-333-7400
                                )
                        )
                )
        )

I am using the PHP example given in the above attached archive, which is provided by official UPS developer resources. The PHP example file I am using is {ARCHIVE_FOLDER}/RatingGROUNDFREIGHTWebService/CodeSamples/Freight/PHP/SoapGroundFreightRateClient.php

I am filling the Configuration variables with the correct values but even after that I am getting that error. Any help would be highly appreciated. THANKS!