section_start:1544112504:prepare_script
Running on runner-a334e492-project-1975139-concurrent-0 via runner-a334e492-gitlab-runner-autoscale-1544109324-afe0eef7...
section_end:1544112505:prepare_script
section_start:1544112505:get_sources
Fetching changes...
Removing coverage-linux/
Removing coverage-unix/
Removing dist/
HEAD is now at bfa65372 element.py: Alter _cache_artifact to use CasBasedDirectory.
Checking out 9245aa46 as jonathan/source-checkout-workspace...
fatal: reference is not a tree: 9245aa46213de923bd53ab1f4f2784e2f1fd925e
section_end:1544112507:get_sources
section_start:1544112507:upload_artifacts_on_failure
section_end:1544112508:upload_artifacts_on_failure
ERROR: Job failed: exit code 1