Why do I get this error when I install R on my computer ?

[ElenaEche]

When I install R, I get this message.
When I want to use RStudio, many packages don't work, etc.

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 1.73 (7892) x86_64-apple-darwin17.0]

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.
[Workspace restored from /Users/Elena/.RData]
[History restored from /Users/Elena/.Rapp.history]

[nirgrahamuk]

@ElenaEche

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.

I highlighted the key part for you.
Utf8 and ascii are different ways computers can store text, so this all relates to the language settings of your computer.

[ElenaEche]

Thank you. How do I change the language setting on my computer?