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When I tried Perl on my cluster/server it gives following error !! How to resolve it?

$ perl
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_PAPER = "de_BE.UTF-8",
LC_ADDRESS = "de_BE.UTF-8",
LC_MONETARY = "de_BE.UTF-8",
LC_NUMERIC = "de_BE.UTF-8",
LC_TELEPHONE = "de_BE.UTF-8",
LC_IDENTIFICATION = "de_BE.UTF-8",
LC_MEASUREMENT = "de_BE.UTF-8",
LC_TIME = "de_BE.UTF-8",
LC_NAME = "de_BE.UTF-8",
LANG = "en_US.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to a fallback locale ("en_US.UTF-8").