Package ‘mvtnorm’ version 1.0.3 cannot be unloaded

[kevin...@gmail.com]

Loading the package after running a few updates for bioreactor caused this very messy error:

> library(compareGroups)
Loading required package: Hmisc
Loading required package: lattice
Loading required package: survival
Loading required package: Formula
Loading required package: ggplot2

Attaching package: ‘Hmisc’

The following objects are masked from ‘package:base’:

format.pval, round.POSIXt, trunc.POSIXt, units

Loading required package: gdata
gdata: read.xls support for 'XLS' (Excel 97-2004) files ENABLED.

gdata: Unable to load perl libaries needed by read.xls()
gdata: to support 'XLSX' (Excel 2007+) files.

gdata: Run the function 'installXLSXsupport()'
gdata: to automatically download and install the perl
gdata: libaries needed to support Excel XLS and XLSX formats.

Attaching package: ‘gdata’

The following object is masked from ‘package:Hmisc’:

combine

The following object is masked from ‘package:stats’:

nobs

The following object is masked from ‘package:utils’:

object.size

Loading required package: xtable

Attaching package: ‘xtable’

The following objects are masked from ‘package:Hmisc’:

label, label<-

Loading required package: SNPassoc
Loading required package: haplo.stats
Loading required package: mvtnorm
Error in unloadNamespace(package) :
namespace ‘mvtnorm’ is imported by ‘multcomp’ so cannot be unloaded
Error in library(pkg, character.only = TRUE, logical.return = TRUE, lib.loc = lib.loc, :
Package ‘mvtnorm’ version 1.0.3 cannot be unloaded

[compareGroups]

First, there seems to be a problem when loading gdata package. Try to execute "'installXLSXsupport()" as it indicates in the warning messate. 

Also, there is a problem when loading mvtnorm package that I don't know how to fix it. Have you tried to download the most recent R and packages version?

Anyway, could you indicate the operating system you are using and the R version?