[BioC] error coercing an exprSet to ExpressionSet

[Kimpel, Mark William]

I have encountered an error when attempting to coerce an exprSet to an ExpressionSet. Below is my code, output, and sessionInfo(). What is the problem? Thanks, Mark

>isCurrent(eset, "exprSet")
               R          Biobase annotatedDataset          exprSet 
            TRUE             TRUE             TRUE             TRUE 
> 
> as(exprSet=eset,"ExpressionSet")
Error in as(exprSet = eset, "ExpressionSet") : 
        unused argument(s) (exprSet = <S4 object of class "exprSet">)

> sessionInfo()
R version 2.4.0 (2006-10-03) 
i386-pc-mingw32 

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United States.1252;LC_MONETARY=English_United States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

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

other attached packages:
    rgu34acdf        svMisc      multtest affycoretools       biomaRt         RCurl           XML       GOstats      Category    genefilter      survival 
     "1.14.0"       "0.9-5"      "1.12.0"       "1.6.0"       "1.8.0"       "0.7-0"     "0.99-93"       "2.0.3"       "2.0.3"      "1.12.0"        "2.29" 
         KEGG          RBGL      annotate            GO         graph      RankProd       RWinEdt         limma          affy        affyio       Biobase 
     "1.14.1"      "1.10.0"      "1.12.0"      "1.14.1"      "1.12.0"       "2.6.0"       "1.7-5"       "2.9.1"      "1.12.1"       "1.2.0"      "1.12.2" 
>

Mark W. Kimpel MD 

 
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