Running with gitlab-runner 11.4.0-rc1 (1ff344e1)
  on docker-auto-scale-com 8a6210b8
Using Docker executor with image dev.gitlab.org:5005/gitlab/gitlab-build-images:ruby-2.4.4-golang-1.9-git-2.18-chrome-69.0-node-8.x-yarn-1.2-postgresql-9.6-graphicsmagick-1.3.29 ...
Starting service postgres:9.6 ...
Pulling docker image postgres:9.6 ...
Using docker image sha256:89bf0dc0dee01ef0e393388e330a3b6aa300066890722548de0f0a00869f3e99 for postgres:9.6 ...
Starting service redis:alpine ...
Pulling docker image redis:alpine ...
Using docker image sha256:05635ee9e1c7e8bf4b0b3265c5085126aced903a9b69cada10796ca13aa033e9 for redis:alpine ...
Waiting for services to be up and running...
Pulling docker image dev.gitlab.org:5005/gitlab/gitlab-build-images:ruby-2.4.4-golang-1.9-git-2.18-chrome-69.0-node-8.x-yarn-1.2-postgresql-9.6-graphicsmagick-1.3.29 ...
Using docker image sha256:deb0862b0eddf817859a97d83783829badf48ecb629465ca858d5e49b7e17f93 for dev.gitlab.org:5005/gitlab/gitlab-build-images:ruby-2.4.4-golang-1.9-git-2.18-chrome-69.0-node-8.x-yarn-1.2-postgresql-9.6-graphicsmagick-1.3.29 ...
section_start:1540378449:prepare_script
Running on runner-8a6210b8-project-4581232-concurrent-0 via runner-8a6210b8-gsrm-1540372602-3674719b...
section_end:1540378451:prepare_script
section_start:1540378451:get_sources
Fetching changes for gt-add-transparent-background-to-markdown-header-tabs with git depth set to 20...
HEAD is now at 818e6c8a Add transparent background to markdown header tabs
Checking out 80b5b5e1 as gt-add-transparent-background-to-markdown-header-tabs...
fatal: reference is not a tree: 80b5b5e1686d48f2a6150d0079223bbde40ddd63
section_end:1540378453:get_sources
section_start:1540378453:get_sources
Fetching changes for gt-add-transparent-background-to-markdown-header-tabs with git depth set to 20...
HEAD is now at 818e6c8a Add transparent background to markdown header tabs
Checking out 80b5b5e1 as gt-add-transparent-background-to-markdown-header-tabs...
fatal: reference is not a tree: 80b5b5e1686d48f2a6150d0079223bbde40ddd63
section_end:1540378454:get_sources
section_start:1540378454:get_sources
Fetching changes for gt-add-transparent-background-to-markdown-header-tabs with git depth set to 20...
HEAD is now at 818e6c8a Add transparent background to markdown header tabs
Checking out 80b5b5e1 as gt-add-transparent-background-to-markdown-header-tabs...
fatal: reference is not a tree: 80b5b5e1686d48f2a6150d0079223bbde40ddd63
section_end:1540378456:get_sources
section_start:1540378456:upload_artifacts_on_failure
Uploading artifacts...
WARNING: coverage/: no matching files              
WARNING: knapsack/: no matching files              
WARNING: rspec_flaky/: no matching files           
WARNING: tmp/capybara/: no matching files          
ERROR: No files to upload                          
Uploading artifacts...
WARNING: junit_rspec.xml: no matching files        
ERROR: No files to upload                          
section_end:1540378457:upload_artifacts_on_failure
ERROR: Job failed: exit code 1