Enterprise Manager - perl: warning: Setting locale failed, LC_ALL =(unset)

Today we faced warnings when starting agent of enterprise manager grid control.

emctl start agent

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
 LANGUAGE = "en_GB:en",
 LC_ALL = (unset),
 LANG = "en_GB"
    are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

check your locale settings by type locale
solution is very simple in the .bash_profile add LC_ALL="en_GB.utf8" :

locale
.........
.........
vi .bash_profile
export LC_ALL="en_GB.utf8"