[BioC] Error in function read.spikein of affycomp

[cstrato]

Dear all,

I would like to use affycomp for my data, but even using the example 
data "s_RMA.csv" I get the following error when trying to read the data:

 > s <- read.spikein("s_RMA.csv")
Error in function (classes, fdef, mtable)  :
  unable to find an inherited method for function "pData", for signature 
"phenoData"

 > sessionInfo()
R version 2.8.0 (2008-10-20)
i386-apple-darwin8.11.1

locale:
C

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

other attached packages:
[1] affycomp_1.18.0 Biobase_2.2.1  
 >

Do you know the reason for this error?

Best regards
Christian
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