R help - Nov 2016 - Fixing non-UTF8 locale and other warning in R for Mac OS X

Hello R Experts,
Please can anyone help or guide me through on how I can fix this problem below
that is usual showed whenever I open R statitsics in Mac OS but I never have
seen this to exist on Window computer. It seems to always refer me to R for Mac
OS X FAQ (see Help) of which I went there many times but couldn't know how
to fix this issue.?

"During startup - Warning messages:1: Setting LC_CTYPE failed, using
"C"?2: Setting LC_COLLATE failed, using "C"?3: Setting
LC_TIME failed, using "C"?4: Setting LC_MESSAGES failed, using
"C"?5: Setting LC_MONETARY failed, using "C"?[R.app GUI 1.68
(7288) x86_64-apple-darwin13.4.0]
WARNING: You're using a non-UTF8 locale, therefore only ASCII characters
will work.Please read R for Mac OS X FAQ (see Help) section 9 and adjust your
system preferences accordingly."


Thanks in anticipation for your guidance.
Umar.?
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