[R] S4 based package giving strange error at install time, but not at check time

[Rajarshi Guha]

Hi, I have a S4 based package package that was loading fine on R  
2.5.0 on both OS X and
Linux. I was checking the package against 2.5.1 and doing R CMD check
does not give any warnings. So I next built the package and installed
it. Though the package installed fine I noticed the following message:

Loading required package: methods
Error in loadNamespace(package, c(which.lib.loc, lib.loc),  
keep.source = keep.source) :
         in 'fingerprint' methods specified for export, but none  
defined: fold, euc.vector, distance, random.fingerprint,  
as.character, length, show
During startup - Warning message:
package fingerprint in options("defaultPackages") was not found

However, I can load the package in R with no errors being reported and
it seems that the functions are working fine.

Looking at the sources I see that my NAMESPACES file contains the
following:

importFrom("methods")
exportClasses("fingerprint")
exportMethods("fold", "euc.vector", "distance", "random.fingerprint",
"as.character", "length", "show")
export("fp.sim.matrix", "fp.to.matrix", "fp.factor.matrix",
"fp.read.to.matrix", "fp.read", "moe.lf", "bci.lf", "cdk.lf")

and all the exported methods are defined. As an example consider the
'fold' method. It's defined as

setGeneric("fold", function(fp) standardGeneric("fold"))
setMethod("fold", "fingerprint",
           function(fp) {
             ## code for the function snipped
           })

Since the method has been defined I can't see why I should see the
error during install time, but nothing when the package is checked.

Any pointers would be appreciated.

-------------------------------------------------------------------
Rajarshi Guha  <rguha at indiana.edu>
GPG Fingerprint: 0CCA 8EE2 2EEB 25E2 AB04  06F7 1BB9 E634 9B87 56EE
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Bus error -- driver executed.