I have generated a custom CDF file. When i try reading the cel files
using the custom CDF file, I get the following error:

Error in list(`AffymetrixCelSet$byName("GBM_TCGA", cdf = cdf)` =
<environment>,  :

[2011-09-15 10:33:57] Exception: Failed to setup a data set for any of
1 data directories located. The following reasons were reported: (1)
Could not locate a file for this chip type: HuEx-1_0-st-v2 (while
trying 'rawData/Dataset1/HuEx-1_0-st-v2').
  at throw(Exception(...))
  at throw.default(msg)
  at throw(msg)
  at method(static, ...)
  at AffymetrixCelSet$byName("Dataset1", cdf = cdf)


verbose <- Arguments$getVerbose(-8, timestamp=TRUE)

chipType <- "HuEx-1_0-st-v2"
cdf <- AffymetrixCdfFile$byChipType(chipType, tag="uniqueprobes")
cel <- AffymetrixCelSet$byName("Dataset1", cdf=cdf)

When reporting problems on aroma.affymetrix, make sure 1) to run the latest 
version of the package, 2) to report the output of sessionInfo() and 
traceback(), and 3) to post a complete code example.

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