[BioC] Bioconductor affy package

[Kim Vaughan]

Hi,
I am trying to use your Bioconductor affy package.  I am following the
Howto load Affymetrix data.  I have entered in the following:
 
library (affy) ##load the affy package
 
and I'm getting the following error:
 
Error in getClass(Class) : "MIAME" is not a defined class
In addition: Warning messages: 
1: There is no package called 'Biobase' in: library(package,
character.only = TRUE, logical = TRUE, warn.conflicts = warn.conflicts,

2: There is no package called 'Biobase' in: library(package,
character.only = TRUE, logical = TRUE, warn.conflicts = warn.conflicts,

Error in library(affy) : .First.lib failed
 
Can you tell me what I am doing wrong?  Thank you in advance.  
 
Kim Vaughan
Research Associate
Medical College of Wisconsin

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