issue executing UcscTrack

[ecastile]

executing:
rTrack <- UcscTrack(genome = genome,
chromosome = chrom, track = "refGene", from = minbase, to = maxbase, trackType = "GeneRegionTrack", rstarts = "exonStarts", rends = "exonEnds", gene = "name", symbol = "name2",

•                 transcript = "name",
  

•                 strand = "strand",
  

•                 fill = "darkblue",
  

•                 stacking = "squish", 
  

•                 name = "RefSeq",
  

•                 showId = TRUE, 
  

•                 geneSymbol = TRUE)                    
  

results in:
Error in match.arg(track, sort(c(availTracks, names(availTracks)))) :
'arg' should be one of "1000G Ph1 Accsbl", "1000G Ph1 Vars", "1000G Ph3 Accsbl", "1000G Ph3 Vars", "5% Lowest S", "acembly", "AceView Genes", "Affy Exon Array", "Affy GNF1H", "Affy RNA Loc", "Affy U133", "Affy U133Plus2", "Affy U95", "affyExonArray", "affyGnf1h", "affyU133", "affyU133Plus2", "affyU95", "All SNPs(138)", "All SNPs(141)", "All SNPs(142)", "All SNPs(144)", "All SNPs(146)", "All SNPs(147)", "All SNPs(150)", "All SNPs(151)", "Allen Brain", "allenBrainAli", "allHg19RS_BW", "Alt Haplotypes", "altSeqLiftOverPsl", "Assembly", "AUGUSTUS", "augustusGene", "avada", "Avada Variants", "BAC End Pairs", "bacEndPairs", "Broad ChromHMM", "Broad Histone", "BU ORChID", "Burge RNA-seq", "burgeRnaSeqGemMapperAlign", "cadd", "CADD", "caddDel", "caddIns", "Caltech RNA-seq", "Cand. Gene Flow", "CCDS", "ccdsGene", "CD34 DnaseI", "CGAP SAGE", "cgapSage", "chainSelf", "Chromosome Band", "Chromosome Band (Ideogram)", "ClinGen", "ClinGen CNVs", "clinGenComp", "clinvar", "ClinVar Variants",