Ruby create web service client with php nusoap?

dear all:
i will use ruby soap client to connect php nusoap server,but can’t
get response data ,can’t help me
thank

wsdl url:
http://www.winson.idv.tw/mytest/nusoap/demo.php?wsdl

ruby wsdl client:
require ‘soap/wsdlDriver’
factory =
SOAP::WSDLDriverFactory.new(“http://www.winson.idv.tw/mytest/nusoap/demo.php?wsdl”)
soap = factory.create_rpc_driver
soap.wiredump_file_base = “log_file”
@soapResponse =
soap.getBook(“query”,“books”,“12345”,“0010354952”,“product”,“books_data”)
soap.reset_stream

result data:

: Data Type Error (SOAP::FaultError)

xml loger file (log_file_getBook_request.xml):
all value is nil?

<?xml version="1.0" encoding="utf-8" ?>