Dear All, When I am trying to perform mainAnalysis using RNAither. I get the below error. Please help me in overcoming this issue. Error in getBM(attributes = c("hgnc_symbol", goIDs), filters = "hgnc_symbol", : The query to the BioMart webservice returned an invalid result: biomaRt expected a character string of length 1. Please report this to the mailing list. Below is my sessionInfo > sessionInfo() R version 2.9.1 (2009-06-26) i386-pc-mingw32 locale: LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252 attached base packages: [1] grid stats graphics grDevices utils datasets methods base other attached packages: [1] biomaRt_2.0.0 RNAither_1.4.1 prada_1.20.0 rrcov_0.5-02 [5] pcaPP_1.7 mvtnorm_0.9-7 robustbase_0.4-5 RColorBrewer_1.0-2 [9] RankProd_2.16.0 topGO_1.12.0 SparseM_0.80 GO.db_2.2.11 [13] RSQLite_0.7-1 DBI_0.2-4 AnnotationDbi_1.6.1 Biobase_2.4.1 [17] graph_1.22.2 loaded via a namespace (and not attached): [1] annotate_1.22.0 geneplotter_1.22.0 lattice_0.17-25 limma_2.18.2 [5] MASS_7.2-47 RCurl_0.98-1 stats4_2.9.1 tools_2.9.1 [9] XML_2.5-1 xtable_1.5-5 Thanks, Kishor