getting same error as posted in "[BioC] Potential reposTools bug (was: simple error)" Follwing fresh install of R1.8.1, Bioconductor 1.3 (Windows XP), loading .cel data and executing "eset <- expresso (Data, widget=TRUE" / selecting methods via widget, R console indicates background correction, attempts URL queries, and fails with error output. Please see full R console output below. Thanks. > eset <- expresso (Data, widget=TRUE) background correction: mas normalization: quantiles PM/MM correction : mas expression values: mas background correcting...Note: You did not specify a download type. Using a default value of: Win32 This will be fine for almost all users Error in FUN(X[[1]], ...) : No direct or inherited method for function "pkgVersion" for this call