guix pull fails for me

[Adam Pribyl]

ATM on guix 0.8 installation from USB invoking guix pull fails. Am I too 
far from the master or something?

compiling 
'/gnu/store/1w0y78nvmivv6a688ljcdnl35dy8m8i7-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 c655a0> ...]
In unknown file:
   ?: 11 [apply-smob/1 #<catch-closure c655a0>]
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 c82880 at 
ice-9/boot-9.scm:4045:3 ()>]
4050: 7 [#<procedure c82880 at ice-9/boot-9.scm:4045:3 ()>]
1724: 6 [%start-stack load-stack #<procedure c95820 at 
ice-9/boot-9.scm:4041:10 ()>]
1729: 5 [#<procedure c98c60 ()>]
In unknown file:
   ?: 4 [primitive-load 
"/gnu/store/blq0man8glfr3rsb4mya4sgn292z3gr3-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/1w0y78nvmivv6a688ljcdnl35dy8m8i7-guix-latest" ...]
  75: 1 [p-for-each #<procedure 1034300 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 1034300 at 
/gnu/store/n2jjh4kzfv3hp4zhd0aflwq4i2jihnnq-module-import/guix/build/pull.scm:121:14 
(file)> 256
builder for `/gnu/store/gvvn13jys2a65yhh2ildqllyx9alg1zd-guix-latest.drv' 
failed with exit code 1
killing process 13118
guix pull: error: build failed: build of 
`/gnu/store/gvvn13jys2a65yhh2ildqllyx9alg1zd-guix-latest.drv' failed


Regards

Adam Pribyl