Package mice: Error in if (meth[j] != "") { : argument is of length zero

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Dear R users,
I am using package mice and I am getting the error "
Error in if (meth[j] != "") { : argument is of length zero." I have tried using several different versions of R (even the one that will be coming out this month) to no avail. I am using RStudio as my interface with R. Also note that I had run this a couple of days ago and it was working fine; I can't, however, remember the version of R that I was using but it was either R-2.11.1 or R-2.12.1. Please find below my code and error. Any thoughts or ideas?

library(mice)
# setting up the default settings for the imputation
ini <- mice(NewPrimal,
Without NewPrimal, we cannot reproduce what you are seeing (this is
where small sample datasets are helpful).
? ? ? ? ? ?seed = 52275,
? ? ? ? ? ?method = "norm",
? ? ? ? ? ?maxit=0,
? ? ? ? ? ?pred = quickpred(NewPrimal,
? ? ? ? ? ? ? ? ? mincor = 0.25,
? ? ? ? ? ? ? ? ? minpuc = 0.95,
? ? ? ? ? ? ? ? ? include = c("D1", "D2", "D3",
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? "Qtr1", "Qtr2", "Qtr3",
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? "Feb", "Mar", "Apr", "May", "Jun", "Jul",
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? "Aug", "Sep", "Oct", "Nov", "Dec"),
? ? ? ? ? ? ? ? ? exclude = c("ActualWeekEndingDate", "Date", "Year")),
? ? ? ? ? ? ? ? ? print=FALSE)

Error in if (meth[j] != "") { : argument is of length zero
You can get more details right after the error by typing:

traceback()

a quick grep of the mice code suggests the error forcing an exit may
occur around line 155.  You might be able to do something like:

fix(mice)

and then add a browser() call in somewhere before line 155 and then
poke around to get a better sense of what is going on.

Cheers,

Josh
Thank you so very much!
Rita

________________________________________

"If you think education is expensive, try ignorance"--Derek Bok

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Joshua Wiley
Ph.D. Student, Health Psychology
University of California, Los Angeles
http://www.joshuawiley.com/