Hi, I am trying to add gene names to match ensembl gene ID, below is the code and the error.
Any suggestions will be good. Thanks a lot!

genemap=getBM(attributes = c("ensemblgeneid","entrezgeneid","hgncsymbol"), + filters = "ensemblgeneid", + values = res$ensembl, + mart = ensembl) Batch submitting query [=============>----------------------------------------------------] 21% eta: 11mError in getBM(attributes = c("ensemblgeneid", "entrezgeneid", "hgncsymbol"), : The query to the BioMart webservice returned an invalid result: biomaRt expected a character string of length 1. Please report this on the support site at http://support.bioconductor.org

Everyone and their mother have been getting this error over the last several weeks. It's not you, it's ensembl. Just keep trying until it works, or try adding a mirror = "uswest" or "useast" or "asia" or removing the mirror part, and then keep trying until it works.

Thank you very much! I tried again and the process works and finally finished, but after running I only saw 3 observations and that's it. There may have something wrong with my code, I am rookie to R and just started and need sometime to figure it out.