Not able to install packages, R

Not able to install packages

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Absolute running time: 0.29 sec, cpu time: 0.49 sec, memory peak: 31 Mb, absolute service time: 0,29 sec

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Error(s), warning(s):

Installing package into ‘/usr/local/lib/R/site-library’
(as ‘lib’ is unspecified)
Warning in install.packages("Rfacebook") :
  'lib = "/usr/local/lib/R/site-library"' is not writable
Error in install.packages("Rfacebook") : unable to install packages
Execution halted

[1] "Hello, world!"

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