perl: warning: Setting locale failed. debian

$ sudo locale-gen
$ sudo dpkg-reconfigure locales

perl: warning: Setting locale failed.

perl: warning: Please check that your locale settings:

LANGUAGE = "en_HK:en",

LC_ALL = (unset),

LC_CTYPE = "UTF-8",

LANG = "en_HK.UTF-8"

    are supported and installed on your system.

perl: warning: Falling back to a fallback locale ("en_HK.UTF-8").