[Rcpp-devel] Error: .onLoad failed in loadNamespace()

I'm using the same versions and I don't get the problem.

getClass is in methods, and Rcpp does have

import(methods)

in its NAMESPACE file.

Maybe this means that the client package also needs it. not sure.

Le 31/05/11 19:55, Laurent Gatto a ?crit :

Dear Romain,

On 31 May 2011 13:34, Romain Francois<romain at r-enthusiasts.com> ?wrote:

Works fine for me. Laurent, can you try with the current svn version of
Rcpp.

svn checkout svn://svn.r-forge.r-project.org/svnroot/rcpp
cd rcpp/pkg
R CMD INSTALL Rcpp
Rscript -e "require(Rcpp); Rcpp.package.skeleton(module=TRUE)"
R CMD check anRpackage

Warning still there, although possibly with a hint:

* checking whether the name space can be loaded with stated
dependencies ... WARNING
Error: .onLoad failed in loadNamespace() for ?anRpackage?, details:
? call: value[[3L]](cond)
? error: failed to load module yada from package anRpackage
could not find function "getClass"
Execution halted

A namespace must be able to be loaded with just the base namespace
loaded: otherwise if the namespace gets loaded by a saved object, the
session will be unable to start.

Probably some imports need to be declared in the NAMESPACE file.

I also updated R-devel; session information is:

R version 2.14.0 Under development (unstable) (2011-05-30 r56024)
Platform: x86_64-unknown-linux-gnu (64-bit)

locale:
?[1] LC_CTYPE=en_GB.utf8 ? ? ? LC_NUMERIC=C
?[3] LC_TIME=en_GB.utf8 ? ? ? ?LC_COLLATE=en_GB.utf8
?[5] LC_MONETARY=en_GB.utf8 ? ?LC_MESSAGES=en_GB.utf8
?[7] LC_PAPER=C ? ? ? ? ? ? ? ?LC_NAME=C
?[9] LC_ADDRESS=C ? ? ? ? ? ? ?LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_GB.utf8 LC_IDENTIFICATION=C

attached base packages:
[1] methods ? stats ? ? graphics ?grDevices utils ? ? datasets ?base

other attached packages:
[1] Rcpp_0.9.4.2


Note that I observed this warning while working on a 'real' package.
In the hope to track its origin down and provide a reproducible
example, I realised that the warning also came up with the standard
Rcpp.package.skeleton output, which ended up in this thread. However,
to my surprise (and embarrassment), I do not have the warning in the
original package any more (whether with Rcpp 0.9.4.2 or 0.9.4.1). I
tried to revert some of the changes I did (moving Rcpp from Depends to
Imports for instance, removing the import(Rcpp) statement in the
NAMESPACE file,...) but without any success.

Not sure I am of any help here...

Best wishes,

Laurent

Romain

Le 30/05/11 21:58, Romain Francois a ?crit :

Le 28/05/11 04:04, Dirk Eddelbuettel a ?crit :

Hi Laurent,

On 27 May 2011 at 17:17, Laurent Gatto wrote:
| Dear all,
|
| A basic packages with Rcpp modules produces the warning described
| below, that I would ideally, with your help, get rid of.
|
| Rscript -e "require(Rcpp); Rcpp.package.skeleton(module=FALSE)"
| R CMD check anRpackage
|
| produces obvious warnings related to badly formatted documentation
and
| license. However
|
| Rscript -e "require(Rcpp); Rcpp.package.skeleton(module=TRUE)"
| R CMD check anRpackage
|
| produces this additional warning that puzzles me:
|
| [ ...checker output... ]
| * checking whether the name space can be loaded with stated
| dependencies ... WARNING
| Error: .onLoad failed in loadNamespace() for ?anRpackage?, details:
| call: value[[3L]](cond)
| error: failed to load module yada from package anRpackage
| Execution halted
|
| A namespace must be able to be loaded with just the base namespace
| loaded: otherwise if the namespace gets loaded by a saved object, the
| session will be unable to start.
|
| Probably some imports need to be declared in the NAMESPACE file.
| [ ...checker output...]
|
| I suspect this may be related to the yada module not being exposed
and
| thus not available when the package is loaded. Any further
explanation
| or hints would however be warmly appreciated.

I think you are pretty close. As I recall, this 'warning' has been a
bit of a
wart that won't quite go away. I just checked again what we do in the
unit
tests in file runit.Module.client.package.R: we build a package (ie
create a
tar.gz) and then install from it. That also triggers the warning, but
passes
it.

Romain may have more details about how this is related to module
initialization and startup.

Dirk

I'll have a go at installing a fresher R-devel and see what the next
move is. My guess is that R checks are tighter now.

|
| sessionInfo() is appended below.
|
| Thank you very much in advance.
|
| Best wishes,
|
| Laurent
|
|
|> ?sessionInfo()
| R version 2.14.0 Under development (unstable) (2011-05-04 r55760)
| Platform: x86_64-unknown-linux-gnu (64-bit)
|
| locale:
| [1] LC_CTYPE=en_GB.utf8 LC_NUMERIC=C
| [3] LC_TIME=en_GB.utf8 LC_COLLATE=en_GB.utf8
| [5] LC_MONETARY=C LC_MESSAGES=en_GB.utf8
| [7] LC_PAPER=en_GB.utf8 LC_NAME=C
| [9] LC_ADDRESS=C LC_TELEPHONE=C
| [11] LC_MEASUREMENT=en_GB.utf8 LC_IDENTIFICATION=C
|
| attached base packages:
| [1] stats graphics grDevices utils datasets methods base
|
| other attached packages:
| [1] Rcpp_0.9.4.1

--
Romain Francois
Professional R Enthusiast
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr
http://romain-francois.com
|- http://bit.ly/hdKhCy : Rcpp article in JSS
|- http://bit.ly/elZJRJ : Montpellier Comedie Club - Avril 2011
`- http://bit.ly/fhqbRC : Rcpp workshop in Chicago on April 28th

--
Romain Francois
Professional R Enthusiast
+33(0) 6 28 91 30 30
http://romainfrancois.blog.free.fr
http://romain-francois.com
|- http://bit.ly/hdKhCy : Rcpp article in JSS
|- http://bit.ly/elZJRJ : Montpellier Comedie Club - Avril 2011
`- http://bit.ly/fhqbRC : Rcpp workshop in Chicago on April 28th