Error at perl locate

[amufaamo]

Hi, I try to run dropseqpipe, but I got error below

perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LANG = "C.UTF-8"
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").

I understand it is perl issue, but I don't know how can I solve this problem.