来自cbr.ru的R和SSOAP的Web服务访问

Question

我正在尝试通过他们的网络服务平台从CBR（俄罗斯中央银行 - cbr.ru）检索数据。基本上，我受到来自this example的代码的启发，使用SS的SSOAP包。

wsdl <- 'http://www.cbr.ru/secinfo/secinfo.asmx?WSDL'
doc  <- xmlInternalTreeParse(wsdl)
def <- processWSDL(doc)
ff  <- genSOAPClientInterface(def = def) 
xmlstr.f <- ff@functions #gives the list of functions that can be accessed 
# just an example of retrieval attempt 
t1 <- new('dateTime',as.POSIXct('2012-10-10')) #creating an object of dateTime class as requested 
xmlstr.f$GCurve(t1) #trying to call SOAP server with GCurve function 

我收到以下错误：

Error in .SOAP(server, .operation@name, parameters = as(parameters, "dateTime"),  : object '.operation' not found 

有人能就这里出了什么问题向我提出建议吗？