This error is usually preceded by a longer message of style::

perl: warning: Please check that your locale settings:
    LANGUAGE = (unset),
    LC_ALL = (unset),
    ....
    LANG = "en_US.UTF-8"
    are supported and installed on your system.

You see your current language using:

$ set | grep LANG

Solution should then be to run:

$ sudo locale-gen en_GB.UTF-8
$ sudo dpkg-reconfigure locales

You might also change LANGUAGE and LANG and LC_ALL envvars to some other locale.