I just installed topGO and tried to run their example:

when I typed: 
    affyLib <- paste(annotation(ALL), "db", sep = ".")
    affyLib
    [1] "hgu95av2.db"
    library(package = affyLib, character.only = TRUE)

got error message: 
    Error in library(package = affyLib, character.only = TRUE) : 
  there is no package called ‘hgu95av2.db’


Anybody has idea what is going on here? Thanks:)
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