Hello
There seems to be an issue with the useMart() which spits out the following error that has been observed before with an old version of Biomart and was fixed by updating.
https://lists.biomart.org/pipermail/users/2012-June/002673.html

Many thanks in advance
-burak

ensembl <- useMart("ensembl")
 
Opening and ending tag mismatch: meta line 5 and head
EntityRef: expecting ';'
Opening and ending tag mismatch: br line 67 and body
Opening and ending tag mismatch: br line 64 and html
Premature end of data in tag br line 62
Premature end of data in tag br line 59
Premature end of data in tag br line 57
Premature end of data in tag hr line 47
Premature end of data in tag img line 45
Premature end of data in tag body line 44
Premature end of data in tag head line 4
Premature end of data in tag html line 3 Error: 1: Opening and ending tag mismatch: meta line 5 and head
2: EntityRef: expecting ';'
3: Opening and ending tag mismatch: br line 67 and body
4: Opening and ending tag mismatch: br line 64 and html
5: Premature end of data in tag br line 62
6: Premature end of data in tag br line 59
7: Premature end of data in tag br line 57
8: Premature end of data in tag hr line 47
9: Premature end of data in tag img line 45
10: Premature end of data in tag body line 44
11: Premature end of data in tag head line 4
12: Premature end of data in tag html line 3

I think I am using the latest version.
R version 3.0.1 (2013-05-16)
Platform: x86_64-pc-linux-gnu (64-bit) locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C         LC_TIME=C            LC_COLLATE=C         LC_MONETARY=C        [6] LC_MESSAGES=C        LC_PAPER=C           LC_NAME=C            LC_ADDRESS=C         LC_TELEPHONE=C      
[11] LC_MEASUREMENT=C     LC_IDENTIFICATION=C  attached base packages:
[1] splines   parallel  stats     graphics  grDevices utils     datasets  methods   base      other attached packages: [1] biomaRt_2.16.0       PFAM.db_2.9.0        GO.db_2.9.0          GOstats_2.26.0       Category_2.26.0      [6] BiocInstaller_1.10.3 dataframes2xls_0.4.5 multtest_2.16.0      GSEABase_1.22.0      annotate_1.38.0     
[11] zoo_1.7-10           edgeR_3.2.4          limma_3.16.7         iRefR_1.1            RBGL_1.36.2         
[16] graph_1.38.3         igraph_0.6.5-2       org.Hs.eg.db_2.9.0   RSQLite_0.11.4       DBI_0.2-7           
[21] AnnotationDbi_1.22.6 Biobase_2.20.1       BiocGenerics_0.6.0   R.utils_1.26.2       R.oo_1.13.9         
[26] R.methodsS3_1.4.4    loaded via a namespace (and not attached): [1] AnnotationForge_1.2.2 IRanges_1.18.3        MASS_7.3-28           RCurl_1.95-4.1        [5] XML_3.98-1.1          biclust_1.0.2         colorspace_1.2-2      genefilter_1.42.0     [9] grid_3.0.1            lattice_0.20-21       stats4_3.0.1          survival_2.37-4      
[13] tools_3.0.1           xtable_1.7-1 
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