[BioC] error with getBM function of biomaRt package

[T Joshi]

Hi,
I was running the example in getBM and got the following error:

getBM(attributes=c("affy_hg_u95av2","hgnc_symbol","chromosome_name","band"),filters="affy_hg_u95av2",values=c("1939_at","1503_at","1454_at"),
mart=mart)
Error in getBM(attributes = c("affy_hg_u95av2", "hgnc_symbol",
"chromosome_name",  :
  could not find function "postForm"

Here is the sessionInfo:
> sessionInfo()
R version 2.7.1 (2008-06-23)
ia64-unknown-linux-gnu
attached base packages:
[1] splines   tools     stats     graphics  grDevices utils     datasets
[8] methods   base

other attached packages:
 [1] GOstats_2.6.0       Category_2.6.0      genefilter_1.20.1
 [4] survival_2.34-1     RBGL_1.18.0         annotate_1.18.0
 [7] xtable_1.5-4        GO.db_2.2.0         AnnotationDbi_1.2.2
[10] RSQLite_0.6-9       DBI_0.2-4           Biobase_2.0.1
[13] graph_1.18.1        biomaRt_1.14.1      RCurl_0.0.666

loaded via a namespace (and not attached):
[1] cluster_1.11.11 tcltk_2.7.1     XML_1.96-0

I also tried with some other data, but it doesn't seem to work anyway.
I have attached the output of debug to this mail. Please let me know
what's happening here.

regards,
Josh