Sir/Madam I ve Illumination file & Control probe file ,when I go for the background correction i get following error: f="ourfinalfile.txt" g="controlprobes.txt" f.l=lumiR(f) ff=addControlData2lumi(g,f.l) Inputting the data ... Annotation columns are not available in the data. Error in getControlData(controlData, type = "data.frame") : Can't find controlData slot, nor do the TargetID looks like control probes > Thanks & Regards KUNAL GAURABH JHA JAIVIK DATA CONSULTENCY [[alternative HTML version deleted]]