R help - Mar 2007 - can't load just saved R object "ReadItem: unknown type 65"

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

According to the logs nothing at all has changed in the serialization
code in a month and nothing of consequence for much longer than that.
To track this down we will need a complete, reproducible, and
preferably minimal example.

Best,

luke

On Thu, 22 Mar 2007, Mark W Kimpel wrote:
> 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"
>
-- 
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:      luke at stat.uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu