[R] Cant upgrade R in ubuntu 14.04

[boredstoog]

I am trying to install R programming language and able to install rbase
using this code without adding repository in *source.list*

sudo apt-get install r-base

After that i tried to upgrade it using this code

sudo add-apt-repository ‘deb
http://star-www.st-andrews.ac.uk/cran/bin/linux/ubuntu/trusty/’
sudo apt-get update
sudo apt-get upgrade

But when i tried the first code

sudo add-apt-repository ‘deb
http://star-www.st-andrews.ac.uk/cran/bin/linux/ubuntu/trusty/’

its giving this error

Error: need a single repository as argument





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