[BioC] error in GSA

[Mayte Suarez-Farinas]

Hi,
I got the following error using GSA package

gsa<-GSA(x=X,y=as.vector(rbind(1:15,-c(1:15))), resp.type="Two class  
paired", genenames=thesymb, geneset=LZ$genesets)

Error in GSA.func(x, y, genesets = genesets, genenames = genenames,  
method = method,  :
   could not find function "paired.ttest.func"

In fact ?paired.ttest.func give the same error but not for ? 
quantitative.func,?multiclass.func

best

Mayte