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Warning message: In open.connection(con, "r") : unable to connect to 'cran.r-project.org' on port 80.

R version 3.1.2, got this error when I install a package. How can I fix this? Warning message: In open.connection(con, "r") : unable to connect to 'cran.r-project.org' on port 80.

I want to install a 'psych' package.