[BioC] biomaRt xMLTreeParse error

[Matt Ritchie]

Dear list,

I'm attempting to use the biomaRt library to annotate a microarray data 
set, and get the following error message (refer below).  This code 
(replacing 'ensembl_mart_37' with 'ensembl_mart_36') worked fine a week 
ago, so perhaps the latest ENSEMBL release (16/2/6) is causing biomaRt 
some trouble?

Many thanks,

Matt Ritchie

 > library(biomaRt)
Loading required package: RMySQL
Loading required package: DBI
Loading required package: XML
 > listMarts()
[1] "ensembl_mart_37" "vega_mart_37"    "snp_mart_37"     "msd_mart_4"
[5] "uniprot_mart_17"
 > mart<-useMart("ensembl_mart_37")
connected to:  ensembl_mart_37
 > listDatasets(mart)
                      dataset    version
1      mmusculus_gene_ensembl    NCBIM34
2  tnigroviridis_gene_ensembl TETRAODON7
3      frubripes_gene_ensembl      FUGU4
4  dmelanogaster_gene_ensembl      BDGP4
5        ggallus_gene_ensembl    WASHUC1
6    scerevisiae_gene_ensembl       SGD1
7       agambiae_gene_ensembl     AgamP3
8     mdomestica_gene_ensembl    BROADO2
9    rnorvegicus_gene_ensembl    RGSC3.4
10    amellifera_gene_ensembl    AMEL2.0
11       btaurus_gene_ensembl   Btau_2.0
12 cintestinalis_gene_ensembl       JGI2
13      celegans_gene_ensembl     CEL150
14      hsapiens_gene_ensembl     NCBI35
15   xtropicalis_gene_ensembl       JGI4
16   cfamiliaris_gene_ensembl    BROADD1
17      mmulatta_gene_ensembl   MMUL_0_1
18  ptroglodytes_gene_ensembl    CHIMP1A
19        drerio_gene_ensembl     ZFISH5
 > mart<-useDataset('mmusculus_gene_ensembl', mart=mart)
Reading database configuration of: mmusculus_gene_ensembl
Entity: line 1: parser error : Start tag expected, '<' not found
NA
^
Error in xmlTreeParse(res[1, ]) : error in creating parser for NA
 > sessionInfo()
R version 2.2.0, 2005-10-06, i686-pc-linux-gnu

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

other attached packages:
 biomaRt      XML   RMySQL      DBI fortunes
 "1.5.2" "0.97-8"  "0.5-5"  "0.1-9"  "1.2-0"