citation() command doesn't work in R.3.1.1

Works with me. And the OS seems to be the same.

 > citation()

To cite R in publications use:

   R Core Team (2014). R: A language and environment for statistical
   computing. R Foundation for Statistical Computing, Vienna, Austria.
   URL http://www.R-project.org/.

A BibTeX entry for LaTeX users is

   @Manual{,
     title = {R: A Language and Environment for Statistical Computing},
     author = {{R Core Team}},
     organization = {R Foundation for Statistical Computing},
     address = {Vienna, Austria},
     year = {2014},
     url = {http://www.R-project.org/},
   }

We have invested a lot of time and effort in creating R, please cite it
when using it for data analysis. See also ?citation("pkgname")? for
citing R packages.

 > sessionInfo()
R version 3.1.1 (2014-07-10)
Platform: x86_64-w64-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=Portuguese_Portugal.1252 
LC_CTYPE=Portuguese_Portugal.1252
[3] LC_MONETARY=Portuguese_Portugal.1252 LC_NUMERIC=C 

[5] LC_TIME=Portuguese_Portugal.1252

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

loaded via a namespace (and not attached):
[1] tools_3.1.1

Rui Barradas

Em 06-08-2014 16:24, Sverre Stausland escreveu:

citation()

Error: $ operator is invalid for atomic vectors
In addition: Warning message:
In packageDescription(pkg = package, lib.loc = dirname(dir)) :
   no package 'base' was found

sessionInfo()

R version 3.1.1 (2014-07-10)
Platform: x86_64-w64-mingw32/x64 (64-bit)

locale:
[1] LC_COLLATE=Norwegian (Bokm?l)_Norway.1252
[2] LC_CTYPE=Norwegian (Bokm?l)_Norway.1252
[3] LC_MONETARY=Norwegian (Bokm?l)_Norway.1252
[4] LC_NUMERIC=C
[5] LC_TIME=Norwegian (Bokm?l)_Norway.1252

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

loaded via a namespace (and not attached):
[1] tools_3.1.1

Sys.getlocale()

[1] "LC_COLLATE=Norwegian (Bokm?l)_Norway.1252;LC_CTYPE=Norwegian
(Bokm?l)_Norway.1252;LC_MONETARY=Norwegian
(Bokm?l)_Norway.1252;LC_NUMERIC=C;LC_TIME=Norwegian
(Bokm?l)_Norway.1252"

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