Error in (Gviz) genetrack<-makeGeneRegionTrack(myGene)

[znasim09]

Hi,
I am unable to use the Gviz genetrack. When i try, it gives me the error (Error in grid.Call.graphics(L_setviewport, vp, TRUE) :
non-finite location and/or size for viewport)

Details are here:

> myGene<-getGene(cuff_data,myGeneId)
> head(features(myGene))
seqnames start end width strand source type score phase gene_id gene_version gene_name gene_source
1 4 11008666 11013860 5195 + ensembl gene NA NA AT4G20400 1 JMJ14 ensembl
2 4 11008666 11013842 5177 + ensembl transcript NA NA AT4G20400 1 JMJ14 ensembl
3 4 11008666 11008818 153 + ensembl exon NA NA AT4G20400 1 JMJ14 ensembl
4 4 11008957 11009045 89 + ensembl exon NA NA AT4G20400 1 JMJ14 ensembl
5 4 11009004 11009045 42 + ensembl CDS NA 0 AT4G20400 1 JMJ14 ensembl
6 4 11009004 11009006 3 + ensembl start_codon NA 0 AT4G20400 1 JMJ14 ensembl
gene_biotype isoform_id transcript_version transcript_name transcript_source transcript_biotype exon_number
1 protein_coding <NA> NA <NA> <NA> <NA> NA
2 protein_coding AT4G20400.1 1 JMJ14 ensembl protein_coding NA
3 protein_coding AT4G20400.1 1 JMJ14 ensembl protein_coding 1
4 protein_coding AT4G20400.1 1 JMJ14 ensembl protein_coding 2
5 protein_coding AT4G20400.1 1 JMJ14 ensembl protein_coding 2
6 protein_coding AT4G20400.1 1 JMJ14 ensembl protein_coding 2
exon_id exon_version protein_id protein_version
1 <NA> NA <NA> NA
2 <NA> NA <NA> NA
3 AT4G20400.1.exon1 1 <NA> NA
4 AT4G20400.1.exon2 1 <NA> NA
5 <NA> NA AT4G20400.1 1
6 <NA> NA <NA> NA
> genetrack<-makeGeneRegionTrack(myGene)
> plotTracks(genetrack)
Error in grid.Call.graphics(L_setviewport, vp, TRUE) :
non-finite location and/or size for viewport

Has any one faced the same problem??
Thanks