Dear all, What I use is the latest version of R: rw2001. And I got the following error message when I run RMA in GeneSpring: Error in sigToEnv(signature, fdef) : Trying to get slot "signature" from an object of a basic class ("NULL") with no slots In addition: Warning message: Incompatible phenoData object. Created a new one. in: read.affybatch(filenames = files) Which information I should provide furthur or the latest version of R has some bugs? Thanks a lot! Xin LIU This e-mail is from ArraDx Ltd The e-mail and any files transmitted with it are confidentia...{{dropped}}