bug#25894: guix pull error

[Quiliro]

After
guix pull
Result of guix system reconfigure /etc/config.scm --fallback
http://sprunge.us/EhFU
config.scm
http://sprunge.us/YBaK

# realpath /proc/$(pgrep guix-daemon | head -n1)/exe
/gnu/store/9nw4zglfl1dc8zc00rikkvln4kgjify9-guix-0.11.0/bin/guix-daemon
# realpath /var/guix/profiles/system/profile/bin/guix
/gnu/store/c77gfhkmnwjvgmnsafjxf1g9kkpiilbh-guix-0.12.0-4.d9da/bin/guix
# guix --version
guix (GNU Guix) 20170227.13
Copyright (C) 2017 the Guix authors
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

-- 
Saluton,
Quiliro