[BioC] error message in GoSeq in if (matched_frac == 0)

[anna [guest]]

Hello,
I performed an analysis with EdgeR followed by an analysis with GoSeq and then I got this error message, saying there is an error in 
if (matched_frac == 0) { :missing value where TRUE/FALSE is required

> pwf=nullp(genes,"hg19","ensGene")
Loading hg19 length data...
Erreur dans if (matched_frac == 0) { : 
  valeur manquante là où TRUE / FALSE est requis

thank you for your help,
best regards,
anna

 -- output of sessionInfo(): 

R version 2.15.2 (2012-10-26)
Platform: i386-w64-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=French_France.1252  LC_CTYPE=French_France.1252   
[3] LC_MONETARY=French_France.1252 LC_NUMERIC=C                  
[5] LC_TIME=French_France.1252    

attached base packages:
[1] splines   stats     graphics  grDevices utils     datasets  methods  
[8] base     

other attached packages:
[1] goseq_1.10.0            geneLenDataBase_0.99.10 BiasedUrn_1.04         
[4] edgeR_3.0.4             limma_3.14.1           

loaded via a namespace (and not attached):
 [1] AnnotationDbi_1.20.3   Biobase_2.18.0         BiocGenerics_0.4.0    
 [4] biomaRt_2.14.0         Biostrings_2.26.2      bitops_1.0-5          
 [7] BSgenome_1.26.1        DBI_0.2-5              GenomicFeatures_1.10.1
[10] GenomicRanges_1.10.5   grid_2.15.2            IRanges_1.16.4        
[13] lattice_0.20-10        Matrix_1.0-10          mgcv_1.7-22           
[16] nlme_3.1-105           parallel_2.15.2        RCurl_1.95-3          
[19] Rsamtools_1.10.2       RSQLite_0.11.2         rtracklayer_1.18.1    
[22] stats4_2.15.2          tools_2.15.2           XML_3.95-0.1          
[25] zlibbioc_1.4.0   

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