R help - Jun 2006 - vague errors on R CMD check for very minimal S4-style package

Hello,

I have a very minimal package "simplepkg" (DESCRIPTION, NAMESPACE, and
R) with S4 classes/methods (defines a class "foo" and a show method
for
that class" - both the class and show method are exported).  I can
seemingly install the package, then load and use it:
> sessionInfo()
Version 2.3.1 (2006-06-01) 
sparc-sun-solaris2.10 

attached base packages:
[1] "methods"   "stats"     "graphics" 
"grDevices" "utils"
"datasets"  "base"     
> library(simplepkg,lib.loc="/home/roels/R/lib")
> 
> getClass("foo")
Slots:
                          
Name:       name       age
Class: character   numeric
> 
> myfoo <- new("foo",name="abc",age=10)
> myfoo
I am  abc 
>
But when I do R CMD check, it fails (or perhaps the "errors" are
really
"warnings"??):
---------------------------------------

sun890% R CMD check simplepkg 
* checking for working latex ... OK
* using log directory '/home/roels/R/dev/simplepkg/simplepkg.Rcheck'
* using Version 2.3.1 (2006-06-01)
* checking for file 'simplepkg/DESCRIPTION' ... OK
* checking extension type ... Package
* this is package 'simplepkg' version '0.1-1'
* checking package dependencies ... OK
* checking if this is a source package ... OK
* checking whether package 'simplepkg' can be installed ... OK
* checking package directory ... OK
* checking for portable file names ... OK
* checking for sufficient/correct file permissions ... OK
* checking DESCRIPTION meta-information ... OK
* checking top-level files ... OK
* checking index information ... OK
* checking package subdirectories ... OK
* checking R files for syntax errors ... OK
* checking R files for library.dynam ... OK
* checking S3 generic/method consistency ... WARNING
Error: package/namespace load failed for 'simplepkg'
Call sequence:
2: stop(gettextf("package/namespace load failed for '%s'",
libraryPkgName(package)), 
       call. = FALSE, domain = NA)
1: library(package, lib.loc = lib.loc, character.only = TRUE, verbose FALSE)
Execution halted
See section 'Generic functions and methods' of the 'Writing R
Extensions'
manual.
* checking replacement functions ... WARNING
Error: package/namespace load failed for 'simplepkg'
Call sequence:
2: stop(gettextf("package/namespace load failed for '%s'",
libraryPkgName(package)), 
       call. = FALSE, domain = NA)
1: library(package, lib.loc = lib.loc, character.only = TRUE, verbose FALSE)
Execution halted
In R, the argument of a replacement function which corresponds to the
right
hand side must be named 'value'.
* checking foreign function calls ... WARNING
Error: package/namespace load failed for 'simplepkg'
Call sequence:
2: stop(gettextf("package/namespace load failed for '%s'",
libraryPkgName(package)), 
       call. = FALSE, domain = NA)
1: library(package, lib.loc = lib.loc, character.only = TRUE, verbose FALSE)
Execution halted
See section 'System and foreign language interfaces' of the 'Writing
R
Extensions' manual.
* checking for missing documentation entries ... ERROR
Error: package/namespace load failed for 'simplepkg'


Here are the file contents:
-------------------------------

sun890% cat DESCRIPTION
Package: simplepkg
Type: Package
Title: Does stuff
Version: 0.1-1
Date: 2006-06-06
Author: Me
Maintainer: Also Me <me at here.com>
Description: Does interesting stuff
License: GPL

sun890% cat NAMESPACE 
exportClasses("foo")
exportMethods("show")

### cat simplepkg.R  #class def and show method
 
setClass("foo",representation(name="character",age="numeric"))

setMethod("show", "foo", function(object) cat("I am
",object at name,"\n",sep=" "))

### cat zzz.R        # required .onLoad  for use of S4-style
classes/methods
.onLoad <- function(lib,pkg) require(methods)





As I said, the package "seems" to work, but I wanted to be sure I
wasn't
missing something that was going to come back to bite me later.

Thanks,

-Steve



*****************************************************************
Steve Roels, Ph.D.                       
Senior Scientist I
Computational Biology               
Millennium Pharmaceuticals, Inc
640 Memorial Drive                 
Cambridge, MA 02139-4815
*****************************************************************





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"Roels, Steven" <Steven.Roels at mpi.com> writes:
> Hello,
>
> I have a very minimal package "simplepkg" (DESCRIPTION,
NAMESPACE, and
> R) with S4 classes/methods (defines a class "foo" and a show
method for
> that class" - both the class and show method are exported).  I can
> seemingly install the package, then load and use it:
>
> Error: package/namespace load failed for 'simplepkg'
> Call sequence:
> 2: stop(gettextf("package/namespace load failed for
'%s'",
> libraryPkgName(package)), 
>        call. = FALSE, domain = NA)
> 1: library(package, lib.loc = lib.loc, character.only = TRUE, verbose >
FALSE)
> Execution halted
>
> Here are the file contents:
> -------------------------------
>
> sun890% cat DESCRIPTION
> Package: simplepkg
> Type: Package
> Title: Does stuff
> Version: 0.1-1
> Date: 2006-06-06
> Author: Me
> Maintainer: Also Me <me at here.com>
> Description: Does interesting stuff
> License: GPL
Try adding LazyLoad: yes to DESCRIPTION (or SaveImage: yes).