error in SOS4r

Hello there,

I'm trying to use SOS4r to get data from ig3is
http://ig3is.grid.unep.ch/istsos/ghg

Here is what I did

> mySOS <- SOS(url = "http://ig3is.grid.unep.ch/istsos/ghg")


> off.temp <- sosOfferings(mySOS)

> obs.temp.procedure.1 <- getObservation(sos = mySOS, offering = off.temp, procedure = sosProcedures(off.temp))
[sos4R] Received response (size: 848 bytes), parsing ...
Error in if (.subtypeIdx > 0) { : argument is of length zero

I can't find what's wrong there so if anyone have an idea?

Guillaume