Problem with lme4 use and installation

Dear all, 

I've been trying to install the lme4 package from
http://r-forge.r-project.org/projects/lme4/. However, when wanting to load
the package, I get an message saying that "x-tabs" are masked (see pasted
code). Can anyone point to what has gone wrong?

Kind regards, 
Andreas Nord
Sweden

utils:::menuInstallLocal()

package 'lme4' successfully unpacked and MD5 sums checked
updating HTML package descriptions

library(lme4)

Loading required package: Matrix
Loading required package: lattice

Attaching package: 'Matrix'


        The following object(s) are masked from package:stats :

         xtabs

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