warning: failed to install locale: Invalid argument

[Cook, Malcolm]

With each call to guix I get

        warning: failed to install locale: Invalid argument

I am using fresh binary install of 0.8.3 into clean CentOS7 following 
http://www.gnu.org/software/guix/manual/html_node/Binary-Installation.html

Can anyone provide guidance on how to proceed on this?

Thx