guix import issue

[Ben Woodcroft <b.woodcroft@uq.edu.au>]

Hi,

I'm having a little trouble using guix import, after successfully 
running guix pull. It seems to occur regardless of the specific package 
I use, and a similar problem occurs when trying to import from cpan (and 
perhaps others). I have not previously run guix import.

Any ideas?

$ guix import pypi GroopM
warning: failed to install locale: Invalid argument
Backtrace:
In ice-9/boot-9.scm:
2864: 19 [resolve-interface (guix scripts import ...) #:select ...]
2789: 18 [#<procedure 9e6f00 at ice-9/boot-9.scm:2777:4 (name #:optional 
autoload version #:key ensure)> # ...]
3065: 17 [try-module-autoload (guix scripts import pypi) #f]
2401: 16 [save-module-excursion #<procedure 123aa20 at 
ice-9/boot-9.scm:3066:17 ()>]
3085: 15 [#<procedure 123aa20 at ice-9/boot-9.scm:3066:17 ()>]
In unknown file:
    ?: 14 [primitive-load-path "guix/scripts/import/pypi" ...]
In guix/scripts/import/pypi.scm:
   19: 13 [#<procedure 12a9940 ()>]
In ice-9/boot-9.scm:
2951: 12 [define-module* (guix scripts import ...) #:filename ...]
2926: 11 [resolve-imports (((guix ui)) ((guix utils)) ((guix import 
pypi)) ...)]
2864: 10 [resolve-interface (guix import pypi) #:select ...]
2789: 9 [#<procedure 9e6f00 at ice-9/boot-9.scm:2777:4 (name #:optional 
autoload version #:key ensure)> # ...]
3065: 8 [try-module-autoload (guix import pypi) #f]
2401: 7 [save-module-excursion #<procedure 123a8d0 at 
ice-9/boot-9.scm:3066:17 ()>]
3085: 6 [#<procedure 123a8d0 at ice-9/boot-9.scm:3066:17 ()>]
In unknown file:
    ?: 5 [primitive-load-path "guix/import/pypi" ...]
In guix/import/pypi.scm:
   19: 4 [#<procedure 12b0660 ()>]
In ice-9/boot-9.scm:
2951: 3 [define-module* (guix import pypi) #:filename ...]
2926: 2 [resolve-imports ((#) (#) (#) (#) ...)]
2867: 1 [resolve-interface (json) #:select ...]
In unknown file:
    ?: 0 [scm-error misc-error #f "~A ~S" ("no code for module" (json)) #f]

ERROR: In procedure scm-error:
ERROR: no code for module (json)

Thanks in advance,
ben.