Error running lda example from Help File (MASS library )

Hello all,

I'm trying to run lda() from the MASS library but the Help example  
generates
the following error:

#Code from example in lda Help file
<no code included>
# Resulting Error

Error in if (targetlist[i] == stringname) { : argument is of length  
zero

Cannot reproduce on setup possibly similar to yours:

 > sessionInfo()
R version 2.10.0 Patched (2009-10-29 r50258)
x86_64-apple-darwin9.8.0

locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8

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

other attached packages:
[1] MASS_7.3-3      plyr_0.1.9      survey_3.18     Design_2.3-0     
Hmisc_3.7-0
[6] survival_2.35-7 lattice_0.17-26

loaded via a namespace (and not attached):
[1] cluster_1.12.1 grid_2.10.0    tools_2.10.0

My Current R Installation:
MacOSX: 10.5.8
R: 2.10.0

What is your sessionInfo(), requested in Posting Guide.

-- 
Gregory Riddick, PhD.
CRTA Research Fellow

National Institutes of Health
National Cancer Institute, Neuro-Oncology Branch
http://home.ccr.cancer.gov/nob/

37 Convent Drive
Building 37, Room 1142
Bethesda, MD 20892-8202

David Winsemius, MD
Heritage Laboratories
West Hartford, CT