Help creating custom channel

[phodina]

Hi, I created package definition and wanted to place it in my custom channel. 
Therefore I placed the channel definition in ~/.config/guix/channels.scm

(cons* (channel
(name 'expanse)
(url "
https://gitlab.com/phodina/expanse
")
(introduction
(make-channel-introduction
"71b93677a2312b2d0af2bfc1cc75eba43fa89ea2"
(openpgp-fingerprint
"418E BDDC 2C3B 1F72 6844  B7C6 7EBE C331 8DB7 196D"))))
%default-channels)

The channel contains the .guix-authorizations and .guix-channel files as well 
as my public key in the keyring branch.There is one package definition in 
expanse/packages/sterm.scm When I run guix pull I get this output:

$ guix pull -K
Updating channel 'expanse' from Git repository at '
https://gitlab.com/phodina/expanse
'...
Updating channel 'guix' from Git repository at '
https://git.savannah.gnu.org/git/guix.git
'...
Authenticating channel 'guix', commits 9edb3f6 to 92032d8 (10 new commits)...
Building from these channels:
guix
https://git.savannah.gnu.org/git/guix.git
92032d8
expanse
https://gitlab.com/phodina/expanse
827a688
substitute: updating substitutes from '
https://ci.guix.gnu.org
'... 100.0%
substitute: updating substitutes from '
https://ci.guix.gnu.org
'... 100.0%
building /gnu/store/2h67qhmnh3hf0pynzk5jggcrbh8fk11j-module-import.drv...
module-import-compiled  1.5MiB                                 2.1MiB/s 00:01 
[##################] 100.0%
building 
/gnu/store/7z39zhgqcw7qcr3ih44rhzrfpmmfm9dm-compute-guix-derivation.drv...
Computing Guix derivation for 'x86_64-linux'... -
substitute: updating substitutes from '
https://ci.guix.gnu.org
'... 100.0%
The following derivations will be built:
/gnu/store/q7fkprrx1yqc6vik31ls0dmwg9mndq7n-profile.drv
/gnu/store/0382fv3ypq8831li0klhfxj3pa5z61vc-expanse.drv
/gnu/store/ilr973xg8asj57lxj0agix1g2qayx68v-guix-92032d808.drv
/gnu/store/6aym9idfnqg5k5dlhbyipr3b2jhdbv0z-guix-command.drv
/gnu/store/3lyzk1niwvrm44b9h56hsmknbqpf829w-guix-module-union.drv
/gnu/store/bjgx1pjwrl5m96y3101nm9pc94ncnh3z-guix-92032d808-modules.drv
/gnu/store/3agckqhaxlzi8xvyssif9ipa86shqk8g-guix-packages-modules.drv
/gnu/store/697adifw2krl36c4si10pz5wkdfn0rz2-guix-system-modules.drv
/gnu/store/aaxfxchqji885i707986pg2m799q9ryy-guix-system-tests-modules.drv
/gnu/store/fsv09san3v40spndv4p7ym4wxzqplnz5-guix-packages-base-modules.drv
/gnu/store/m39nl7icxvf3qycajnhjsji36lakh7k8-guix-config-modules.drv
/gnu/store/a7nq6p35bv8mdz2s7v1kkryq4b65js0r-guix-config.drv
/gnu/store/kz3jvd0v5b98ss9b6f6inq5jmjfd6hk3-guix-config-source.drv
/gnu/store/lc5vkhyp7wf7s9m1gjrifryxlg1qqgjg-config.scm.drv
/gnu/store/n57yb1dw5ixm5vm2cla92yxsb2kgy94f-guix-cli-modules.drv
/gnu/store/r8dbpvgikfnkar9rqx8ps7glk1gaqsj6-guix-extra-modules.drv
/gnu/store/vhmmlz0sca70paq4a00ng6gbhydivxfz-guix-daemon.drv
/gnu/store/nw4bfijh29frvix5x93krbfwdzgl36ny-inferior-script.scm.drv
/gnu/store/q00jp79aclams7gfil09k3vmplp0sqsh-profile.drv

7 items will be downloaded
guix-cli                                                             2.1MiB/s 
00:00 | 1017KiB transferred
guix-extra                                                            2.4MiB/s 
00:01 | 2.9MiB transferred
guix-packages                                                         2.5MiB/s 
00:02 | 3.9MiB transferred
guix-packages-base  12.0MiB                                    5.3MiB/s 00:02 
[##################] 100.0%
guix-system                                                          5.9MiB/s 
00:02 | 10.0MiB transferred
guix-system-tests  382KiB                                      2.0MiB/s 00:00 
[##################] 100.0%
module-import-compiled  165KiB                                 5.7MiB/s 00:00 
[##################] 100.0%
building /gnu/store/lc5vkhyp7wf7s9m1gjrifryxlg1qqgjg-config.scm.drv...
building /gnu/store/n57yb1dw5ixm5vm2cla92yxsb2kgy94f-guix-cli-modules.drv...
building /gnu/store/kz3jvd0v5b98ss9b6f6inq5jmjfd6hk3-guix-config-source.drv...
building /gnu/store/r8dbpvgikfnkar9rqx8ps7glk1gaqsj6-guix-extra-modules.drv...
building /gnu/store/a7nq6p35bv8mdz2s7v1kkryq4b65js0r-guix-config.drv...
building 
/gnu/store/fsv09san3v40spndv4p7ym4wxzqplnz5-guix-packages-base-modules.drv...
building /gnu/store/m39nl7icxvf3qycajnhjsji36lakh7k8-guix-config-modules.drv...
building 
/gnu/store/3agckqhaxlzi8xvyssif9ipa86shqk8g-guix-packages-modules.drv...
building /gnu/store/697adifw2krl36c4si10pz5wkdfn0rz2-guix-system-modules.drv...
building 
/gnu/store/aaxfxchqji885i707986pg2m799q9ryy-guix-system-tests-modules.drv...
building 
/gnu/store/bjgx1pjwrl5m96y3101nm9pc94ncnh3z-guix-92032d808-modules.drv...
building /gnu/store/3lyzk1niwvrm44b9h56hsmknbqpf829w-guix-module-union.drv...
building /gnu/store/6aym9idfnqg5k5dlhbyipr3b2jhdbv0z-guix-command.drv...
building /gnu/store/vhmmlz0sca70paq4a00ng6gbhydivxfz-guix-daemon.drv...
building /gnu/store/ilr973xg8asj57lxj0agix1g2qayx68v-guix-92032d808.drv...
building /gnu/store/0382fv3ypq8831li0klhfxj3pa5z61vc-expanse.drv...
|builder for `/gnu/store/0382fv3ypq8831li0klhfxj3pa5z61vc-expanse.drv' failed 
to produce output path `/gnu/store/sqns9h0rwrfg9986szfzqsww7hx6i88c-expanse'
build of /gnu/store/0382fv3ypq8831li0klhfxj3pa5z61vc-expanse.drv failed
View build log at 
'/var/log/guix/drvs/03/82fv3ypq8831li0klhfxj3pa5z61vc-expanse.drv.bz2'.
note: keeping build directory `/tmp/guix-build-expanse.drv-2'cannot build 
derivation `/gnu/store/q7fkprrx1yqc6vik31ls0dmwg9mndq7n-profile.drv': 1 
dependencies couldn't be built
guix pull: error: build of 
`/gnu/store/q7fkprrx1yqc6vik31ls0dmwg9mndq7n-profile.drv' failed

Could it fail due to the fact that /tmp/guix-build-expanse.drv-2 is empty? If 
so how to structure channel and what other fies (scheme code) are necessary?

$ bzcat /var/log/guix/drvs/03/82fv3ypq8831li0klhfxj3pa5z61vc-expanse.drv.bz2
(repl-version 0 1 1)
(exception misc-error (value #f) (value "no code for module ~S") (value 
((expanse packages sterm))) (value #f))

Kind regards
Petr Hodina

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