A newbie here - please forgive me if this is a basic question.  We have an
in house package built in R 2.2.1 (yes we're a little behind the times at
our firm)and would like to rebuild it using R 2.5.1.  However, when I try
and build the package from source, I keep getting this error:

Error in as(slotVal, slotClass, strict = FALSE) :
        no method or default for coercing "POSIXt" to "POSIXct"
Error : unable to load R code in package 'Mango'
Error: package/namespace load failed for 'Mango'


I tried defining a new method "as.POSIXct" in the package to coerce POSIXt
to POSIXct and then added the as.POSIXct method to the "NAMSPACE" file.  The
build still doesn't work (I get the same error message). Any idea what I am
doing wrong? The coercion statement looks like this and works in R GUI:

#from is a vector of dates in the format "%d-%b-%Y")
from <- as.POSIXct(strptime(from, format = "%d%b%Y"), tz = "GMT")

Here is my environment info:

R version 2.5.1 (2007-06-27)
i386-pc-mingw32

locale:
LC_COLLATE=English_United Kingdom.1252;LC_CTYPE=English_United
Kingdom.1252;LC_MONETARY=English_United
Kingdom.1252;LC_NUMERIC=C;LC_TIME=English_United Kingdom.1252

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

other attached packages:
  fSeries      nnet      mgcv   fBasics fCalendar   fEcofin   spatial
MASS
 "251.70"  "7.2-34"  "1.3-25"  "251.70"  "251.70"  "251.70"  "7.2-34"  "
7.2-34"
I would sincerely appreciate any help.

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