Hy, I'm working with R (Version 2.3.1) and Bioconductor(1.8) on Linux (Ubuntu). I'm trying biomaRt, but after installing the package can't create a mart object; here it is the error returned. Can anybody help me? Best regards. Javi > mart <- useMart("ensembl") Error in validObject(.Object) : invalid class "Mart" object: invalid object for slot "vschema" in class "Mart": got class "NULL", should be or extend class "character"

Hi Javier, The biomaRt version you're using is too old, you'll have install a newer R version and update to BioC 1.9. best, Steffen Javier D?ez wrote: > Hy, > I'm working with R (Version 2.3.1) and Bioconductor(1.8) on Linux (Ubuntu). > I'm trying biomaRt, but after installing the package can't create a mart > object; here it is the error returned. Can anybody help me? > Best regards. > Javi > > > mart <- useMart("ensembl") > Error in validObject(.Object) : invalid class "Mart" object: invalid > object for slot "vschema" in class "Mart": got class "NULL", should be > or extend class "character" > > _______________________________________________ > Bioconductor mailing list > Bioconductor at stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/bioconductor > Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor > -- Steffen Durinck, Ph.D. Oncogenomics Section Pediatric Oncology Branch National Cancer Institute, National Institutes of Health URL: http://home.ccr.cancer.gov/oncology/oncogenomics/ Phone: 301-402-8103 Address: Advanced Technology Center, 8717 Grovemont Circle Gaithersburg, MD 20877