[BioC] \'mirna20probe

[ATTIA [guest]]

H i there
I am reading  cel files from genechip miRNA 2.0 array affymatrix  in to  affy package 
spleen.affy = ReadAffy()
 
for gcrma I get 

>gcrma(spleen.affy)
I get following error 
[1] "Environment mirna20probe was not found in the 
Error in get(probepackagename) : object 'mirna20probe' not found
where do I get that 'mirna20probe package 
Thanks

 -- output of sessionInfo(): 

>  sessionInfo()
R version 2.13.1 (2011-07-08)
Platform: x86_64-pc-mingw32/x64 (64-bit)

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

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

other attached packages:
[1] AnnotationDbi_1.14.1 limma_3.8.3          gcrma_2.24.1         puma_2.4.0           mclust_3.4.10        mirna20cdf_2.8.0     affy_1.30.0         
[8] Biobase_2.12.2      

loaded via a namespace (and not attached):
[1] affyio_1.20.0         Biostrings_2.20.3     DBI_0.2-5             IRanges_1.10.6        preprocessCore_1.14.0 RSQLite_0.10.0        splines_2.13.1       
[8] tools_2.13.1         
> 


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