[R] can't load just saved R object "ReadItem: unknown type 65"

[Mark W Kimpel]

I have run into a problem loading a just saved R object using R-devel. I 
have been saving and loading this particular type of R object for a long 
while and never ran into this problem. I save, then immediately reload 
(to test save) and get "ReadItem: unnknown type 65".

This error is reproducible after logout from server and restart of emacs 
and R.

Below is my output and sessionInfo().

Thanks,
Mark

 > setwd("~/Genomics/Experiments.Genomic/BB01/acb.shell")
 > local(save(affy.object.preprocessed, file 
="affy.object.preprocessed.R" ))
 > load("affy.object.preprocessed.R")
Error in load("affy.object.preprocessed.R") :
	ReadItem: unknown type 65, perhaps written by later version of R
 > sessionInfo()
R version 2.5.0 Under development (unstable) (2007-03-11 r40824)
powerpc64-unknown-linux-gnu

locale:
LC_CTYPE=en_US.UTF-8;LC_NUMERIC=C;LC_TIME=en_US.UTF-8;LC_COLLATE=en_US.UTF-8;LC_MONETARY=en_US.UTF-8;LC_MESSAGES=en_US.UTF-8;LC_PAPER=en_US.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.UTF-8;LC_IDENTIFICATION=C

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

other attached packages:
      multtest    rat2302cdf affycoretools       annaffy        xtable
      "1.13.1"      "1.15.0"       "1.7.8"       "1.7.3"       "1.4-3"
         gcrma   matchprobes       biomaRt         RCurl           XML
       "2.7.3"       "1.7.4"      "1.9.21"       "0.8-0"       "1.6-0"
       GOstats      Category        Matrix       lattice    genefilter
      "2.1.13"      "2.1.20"   "0.9975-11"     "0.14-16"      "1.13.8"
      survival          KEGG          RBGL      annotate            GO
        "2.31"     "1.15.12"      "1.11.4"      "1.13.6"     "1.15.12"
         graph         limma          affy        affyio       Biobase
      "1.13.6"      "2.9.13"     "1.13.14"       "1.3.3"     "1.13.39"
-- 
Mark W. Kimpel MD
Neuroinformatics
Department of Psychiatry
Indiana University School of Medicine