You need to go to the metaData page on BioC and get the hu6800probe package. Once you have this installed, GCRMA will be happy. Best, Jim James W. MacDonald Affymetrix and cDNA Microarray Core University of Michigan Cancer Center 1500 E. Medical Center Drive 7410 CCGC Ann Arbor MI 48109 734-647-5623 >>> "Stiles, David (NIH/NIDDK)" <davidst@intra.niddk.nih.gov> 03/20/04 07:11PM >>> Dear Bioconductor Support Group, I'm currently trying to run GCRMA on a set of old Hu6800 GeneChip CEL files and keep getting is strange error: "Error in get(x, envir, mode, inherits) : variable "hu6800probe" was not found". If anyone has any suggestions on how I can fix this problem just send me an email or post a reply to this message board. I have downloaded and installed all necessary packages and I am using the alpha build of version 1.9.0 of RGui for Windows. If you need additional information just let me know. Thank you in advance for helping me with this problem. Yours truly, David Stiles Technologist NIH/NIDDK Microarray Core Facility Phone: (301) 496-0175 Fax: (301) 480-0855 _______________________________________________ Bioconductor mailing list Bioconductor@stat.math.ethz.ch https://www.stat.math.ethz.ch/mailman/listinfo/bioconductor