bug#18887: guix pull failed

[Igor Gajsin <igajsin@mirantis.com>]

Hello, folks.

I try to pull guix, but it is not work neither by root nor by user.

This is a output of `guix pull --verbose`

compiling 
'/gnu/store/akma9bmmjnizkv9sj1669wa8x4abrzyp-guix-latest/guix/import/pypi.scm'...
ERROR: no code for module (json)
Backtrace:
In ice-9/boot-9.scm:
  157: 12 [catch #t #<catch-closure 9ba5a0> ...]
In unknown file:
    ?: 11 [apply-smob/1 #<catch-closure 9ba5a0>]
In ice-9/boot-9.scm:
   63: 10 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
  432: 9 [eval # #]
In ice-9/boot-9.scm:
2401: 8 [save-module-excursion #<procedure 9d7880 at 
ice-9/boot-9.scm:4045:3 ()>]
4050: 7 [#<procedure 9d7880 at ice-9/boot-9.scm:4045:3 ()>]
1724: 6 [%start-stack load-stack #<procedure 9ea840 at 
ice-9/boot-9.scm:4041:10 ()>]
1729: 5 [#<procedure 9ecc60 ()>]
In unknown file:
    ?: 4 [primitive-load 
"/gnu/store/2cfbcxyx6nc22v7raj3v094ky2544ks5-guix-latest-guile-builder"]
In ice-9/eval.scm:
  387: 3 [eval # ()]
In 
/gnu/store/n2jjh4kzfv3hp4zhd0aflwq4i2jihnnq-module-import/guix/build/pull.scm:
  121: 2 [build-guix 
"/gnu/store/akma9bmmjnizkv9sj1669wa8x4abrzyp-guix-latest" ...]
   75: 1 [p-for-each #<procedure d690c0 at 
/gnu/store/n2jjh4kzfv3hp4zhd0aflwq4i2jihnnq-module-import/guix/build/pull.scm:121:14 
(file)> ...]
In unknown file:
    ?: 0 [scm-error misc-error #f ...]

ERROR: In procedure scm-error:
ERROR: process failed #<procedure d690c0 at 
/gnu/store/n2jjh4kzfv3hp4zhd0aflwq4i2jihnnq-module-import/guix/build/pull.scm:121:14 
(file)> 256
builder for 
`/gnu/store/0nji4jqs90lvm8sbx5j8iwfwl4fqpir7-guix-latest.drv' failed 
with exit code 1
guix pull: error: build failed: build of 
`/gnu/store/0nji4jqs90lvm8sbx5j8iwfwl4fqpir7-guix-latest.drv' failed