[BioC] HTqPCR problem

[David martin]

I'm manually building a qPCRset object that used to work until i switch 
from R 2.12 to 2.15.


 >dim(X) #data matrix (for the moment it contains only zero values)
[1] 3 72

 >dim(cat)#data matrix with charactacter string("OK")
[1] 3 72

#Build Qpcr Object
out <- new("qPCRset", exprs=X, flag=as.data.frame(X), featureCategory=cat)


 > out
An object of class "qPCRset"
Size:  0 features, 72 samples
Feature types:
Feature names:           NA NA NA ...
Feature classes:
Error in `row.names<-.data.frame`(`*tmp*`, value = value) :
   invalid 'row.names' length
 >

What is the problem ????