[BioC] AnnBuilder: sourceURLs not found error

[Elisabetta Manduchi]

Hello,
I'm running R 1.9.1 on Windows 2000 and tried to test some of the code in 
the AnnBuilder (1.4.2) package from the vignette.
I'm encountering an error, which I'm not clear on how to fix. Code and 
error are copied below. Note that I've tried to run the same code on Linux 
(R version 1.9.0) and got the same error.
Any advice on this?
Thanks,
Elisabetta

---
> myBase<-file.path(.path.package("AnnBuilder"), "data", "thgu95a")
> myBaseType<-"gb"
> mySrcUrls<-c(LL="http://www.bioconductor.org/datafiles/wwwsources/Tll_tmpl.gz", 
UG="http://www.bioconductor.org/datafiles/wwwsources/Ths.data.gz", 
GO="http://www.bioconductor.org/datafiles/wwwsources/Tgo.xml")
> ABPkgBuilder(baseName=myBase, srcUrls=mySrcUrls, baseMapType=myBaseType, 
pkgName="myPkg", pkgPath="C:\tmp", organism="human", makeXML=F)
[1] "It may take me a while to process the data. Be patient!"
Error in url(sourceURLs[["GO"]], open = "r") :
         Object "sourceURLs" not found
---