Hi, I am a new user of BioConductor, and am currently working on Affy data analysis. I am trying to set up my own CDF package using the "makecdfenv" package. Here are the problems: -> Assuming that I have loaded the "makecdfenv" library, and stored the .CDF file in my current working directory, however, every time when I ran "R>make.cdf.package(my.CDF file), the error message I got was "the function creatPackage could not be found", disregarding what platform I used to run R, either unix or windows version. -> On the other hand, I was able to run R>make.cdf.env(my.CDF file) to simply creat the CDF environment. However, when I proceed to further analysis such as those functions in "affy" library, the error message I got was "Error in .local(object, ...) : Information about probe locations for XXXXXXXX could not be found. Try downloading the XXXXXXXX package from http://www.bioconductor.org/data/cdfenvs/cdfenvs.html". So it appeared that by just creating the environment is not enough and I still need the CDF package. My questions are the follows: 1) what is the function called "creatPackage"? Is this function supposed to be built inside the "makecdfenv" package? If not, how should I check or look for this function? 2) Is there anything else I should do to, in addition to just creating the environment, to make the CDF environment work? Thanks you very much for your help! joan