Running with gitlab-runner 12.8.0 (1b659122)
  on universal-tn3 a9da50a7
section_start:1583229242:prepare_executor
Using Docker executor with image quantumtinkerer/research ...
Authenticating with credentials from /root/.docker/config.json
Pulling docker image quantumtinkerer/research ...
Using docker image sha256:d3c1811e93c7604550a9f0e2373056d246db45c27257d26feecec273c77d9f83 for quantumtinkerer/research ...
section_end:1583229244:prepare_executor
section_start:1583229244:prepare_script
Authenticating with credentials from /root/.docker/config.json
Running on runner-a9da50a7-project-713-concurrent-1 via tnw-tn3.tudelft.net...
section_end:1583229246:prepare_script
section_start:1583229246:get_sources
Authenticating with credentials from /root/.docker/config.json
Fetching changes...
Reinitialized existing Git repository in /builds/solidstate/lectures/.git/
From https://gitlab.kwant-project.org/solidstate/lectures
 * [new ref]         refs/pipelines/29705 -> refs/pipelines/29705
   e1a51ac..0fcdb57  master               -> origin/master
Checking out 0fcdb57d as master...
Removing site/

Skipping Git submodules setup
section_end:1583229248:get_sources
section_start:1583229248:restore_cache
Authenticating with credentials from /root/.docker/config.json
section_end:1583229250:restore_cache
section_start:1583229250:download_artifacts
Authenticating with credentials from /root/.docker/config.json
Downloading artifacts for build lectures (104493)...
Downloading artifacts from coordinator... ok        id=104493 responseStatus=200 OK token=VR3oCMEN
section_end:1583229254:download_artifacts
section_start:1583229254:build_script
Authenticating with credentials from /root/.docker/config.json
$ git checkout master; git reset --hard origin/master
Previous HEAD position was 0fcdb57 Update 7_tight_binding.md
Switched to branch 'master'
Your branch is behind 'origin/master' by 1 commit, and can be fast-forwarded.
  (use "git pull" to update your local branch)
HEAD is now at 0fcdb57 Update 7_tight_binding.md
$ git checkout local; git reset --hard origin/local
Switched to branch 'local'
Your branch is up to date with 'origin/local'.
HEAD is now at c4b673e Update 7_tight_binding.md
$ git diff-index --quiet master || git -c "user.name=$GITLAB_USER_NAME" -c "user.email=$GITLAB_USER_EMAIL" merge master
Auto-merging src/7_tight_binding.md
CONFLICT (content): Merge conflict in src/7_tight_binding.md
Automatic merge failed; fix conflicts and then commit the result.
section_end:1583229256:build_script
section_start:1583229256:after_script
section_end:1583229258:after_script
section_start:1583229258:upload_artifacts_on_failure
Authenticating with credentials from /root/.docker/config.json
section_end:1583229260:upload_artifacts_on_failure
ERROR: Job failed: exit code 1