Warning: use of NULL environment is deprecated (in R CMD check)

* checking S3 generic/method consistency ... WARNING
Warning: use of NULL environment is deprecated
Warning: use of NULL environment is deprecated
See section 'Generic functions and methods' of the 'Writing R Extensions'
manual.

I don't get any other warnings or errors.  Can anyone suggest what the
problem might be? (R2.3.0, OS X)

I'd guess you're using a pre-release version of 2.3.0.  If that's not 
it, then it may be an error in your package, using envir=NULL some place 
you shouldn't (but that doesn't explain why the error arose where it did).

If neither of those apply, I'd like to try to duplicate the error. 
Could you send me a tarball of the package?

Duncan Murdoch

I don't get any other warnings or errors.  Can anyone suggest what the
problem might be? (R2.3.0, OS X)

For reference: the problem was caused by having dependent packages
that been installed prior to R 2.3.0.

Hadley