Hi Sean, Thanks for your help. I just managed to sort out few things. Now the problem is only with the installation of org.At.tair.db. It gives me the following errors. It will be helpful if you could give me some clue. ** help *** installing help indices ** building package indices ... ** testing if installed package can be loaded Error : .onLoad failed in loadNamespace() for 'org.At.tair.db', details: call: sqliteExecStatement(con, statement, bind.data) error: RS-DBI driver: (error in statement: database is locked) ERROR: loading failed * removing ?/home/reetu/R/x86_64-redhat-linux-gnu- library/2.11/org.At.tair.db? The downloaded packages are in ?/tmp/Rtmpjh4uP8/downloaded_packages? Warning message: In install.packages(pkgs = pkgs, repos = repos, ...) : installation of package 'org.At.tair.db' had non-zero exit status Many thanks for your help. RT