Error while installing gbm in R on redhat

Question

I want to install gbm in R so using the command install.packages("gbm") but getting the error message:

Error : package 'parallel' could not be loaded
ERROR: lazy loading failed for package ‘gbm’

My system is Red Hat Enterprise Linux Workstation release 6.2 (Santiago). Any solution?

EDIT:

When I try to install "parallel" using install.packages("parallel") I get the following warning:

Warning in install.packages("parallel") :
  argument 'lib' is missing: using '/home/abhay/R/x86_64-unknown-linux-gnu-library/2.10'
Warning message:
In getDependencies(pkgs, dependencies, available, lib) :
  package ‘parallel’ is not available

What library should I specify?