[BioC] Error when running expresso

[Kelvin Yen]

I recently installed R 1.7.1 and tried analyzing my data by running 
rma via expresso and get the following error:

>  expresso(data,widget=TRUE)
background correction: rma
normalization: quantiles
PM/MM correction : pmonly
expression values: medianpolish
background correcting...done.
normalizing...Error in apply(intensity(abatch)[pms, ], 1, function(x) 
all(!is.na(x))) :
         dim(X) must have a positive length

If I run "rma(data)" I don't get the error and when I ran the above 
on R 1.6.1 I didn't get an error.  Anyone have an idea as to why I 
get the error?  The reason why I want to run rma via expresso is so I 
can use the MAS summary method.

Kelvin