It was not a problem of configuration. The same errors ocur on different installations.

test-name: dead path can be explicitly collected
location: /tmp/guix-build-guix-0.13.0.drv-0/source/tests/store.scm:178
actual-value: #f

test-name: verify-store + check-contents
location: /tmp/guix-build-guix-0.13.0.drv-0/source/tests/store.scm:815
actual-error: + (srfi-34 +   #<condition &nix-protocol-error [message: "path `dtmp/guix-tests/store/462z3fnl7bs44vp9s97jyg1z74nsfvly-tar' is not in the Nix store" status: 1] efdae0>)

Perhaps it is something about some package missing.
 
--
Saluton,
Quiliro
0987631031