[rkward-users] Error of object format with Ubuntu

[Seb R]

Hi,
I've been using rkward for a while now with Ubuntu.
I use the latest version of r-cran with the latest version of rkward
(stable or daily build).
Since I am on trusty, but also on utopic, whatever the version of rkward I
used, I got the following errors :

----------------------------
>     rm(list=ls())
>     library(raster)
Le chargement a nécessité le package : sp
Erreur : LOGICAL() can only be applied to a 'logical', not a 'list'
Avis : failure to get object prototype
>       trace(raster:::.polygonsToRaster,edit=TRUE)
Erreur dans as.character(name) :
  cannot coerce type 'closure' to vector of type 'character'
------------------------------

This must not be a problem of the raster library as I don't get the problem
when using Rstudio or the terminal directly.
Any idea on how to circumvent this problem ?
Thank you
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