Hello everyone: Could someone please spot the error that I am making in creating a cdf environment? > library(affy) > library(makecdfenv) > pname<-cleancdfname(whatcdf("YY002001.cel")) > list(pname) [[1]] [1] "xxxx007a46cdf" > xxxx007a46cdf<-make.cdf.env("xxxx007a46.cdf") Reading CDF file. Creating CDF environment Wait for about 827 dots....... > length(ls(xxxx007a46cdf)) [1] 82661 > eset<-justRMA() Note: Using download type: Win32 Error in getCdfInfo(object) : Could not obtain CDF environment, problems encountered: Specified environment specified did not contain SYNG007a520046 Library - package syng007a520046cdf not installed Data for package affy did not contain SYNG007a520046 Bioconductor - syng007a520046cdf not available Thanks for your help. C. Hannam