Installing R on Mac - Warning messages: Setting LC_CTYPE failed, using "C"

1. Open Terminal
2. Write or paste in: defaults write org.R-project.R force.LANG en_US.UTF-8
3. Close Terminal (including any RStudio window)
4. Start R

For someone runs R in a docker environment (under root), try to run R with below command,

LC_ALL=C.UTF-8 R# instead of just `R`

Setting locales in terminal resolved the issue for me. Open the terminal and

1. Check if locale settings are missing

   > localeLANG=LC_COLLATE="C"LC_CTYPE="UTF-8"LC_MESSAGES="C"LC_MONETARY="C"LC_NUMERIC="C"LC_TIME="C"LC_ALL=

2. Edit ~/.profile or ~/.bashrc

   export LANG=en_US.UTF-8export LC_ALL=en_US.UTF-8

3. Run . ~/.profile or . ~/.bashrc to read from the file.

4. Open a new terminal window and check that the locales are properly set

   > localeLANG="en_US.UTF-8"LC_COLLATE="en_US.UTF-8"LC_CTYPE="en_US.UTF-8"LC_MESSAGES="en_US.UTF-8"LC_MONETARY="en_US.UTF-8"LC_NUMERIC="en_US.UTF-8"LC_TIME="en_US.UTF-8"LC_ALL="en_US.UTF-8"

Just open the R(software) and copy and paste

system("defaults write org.R-project.R force.LANG en_US.UTF-8")

Hope this will work fine or use the other method

open(on mac): Utilities/Terminal copy and pastedefaults write org.R-project.R force.LANG en_US.UTF-8

and close both terminal and R and reopen R.