Hi,
I Ran the following code and it did not work and asked me to report the
error to the list. So here it is:
### Code####
library (biomaRt);
snps <- useMart("snp", dataset="hsapiens_snp");
filters <- listFilters(snps);
attributes <- listAttributes(snps);
#
required_attributes <- attributes[,1]
required_list <- c("ENSG00000006638" ,"ENSG00000110148");
i22 <- getBM(  attributes=required_attributes[30:45],
filters="ensembl_gene", values=required_list, mart=snps)
### Code End ###

and got the following error:
>>>>>>>>>>>>>
Error in getBM(attributes = required_attributes[30:45], filters =
"ensembl_gene",  :
  The query to the BioMart webservice returned an invalid result: the number
of columns in the result table does not equal the number of attributes in
the query. Please report this to the mailing list.
>>>>>>>>>>>>>

> sessionInfo()
R version 2.9.0 (2009-04-17)
i486-pc-linux-gnu

locale:
LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=C;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] biomaRt_2.0.0

loaded via a namespace (and not attached):
[1] RCurl_0.97-3 XML_2.3-0

-Best
-Lax

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