Waiting for services to be up and running...
Pulling docker image docker:stable ...
Using docker image sha256:062267097b77e3ecf374b437e93fefe2bbb2897da989f930e4750752ddfc822a for docker:stable ...
section_start:1542386403:prepare_script
Running on runner-a334e492-project-1975139-concurrent-0 via runner-a334e492-gitlab-runner-autoscale-1542386138-b0500837...
section_end:1542386405:prepare_script
section_start:1542386405:get_sources
Fetching changes...
HEAD is now at b5b79056 Merge branch 'aevri/unit_tests' into 'master'
Checking out 81f88f67 as tpollard/494...
fatal: reference is not a tree: 81f88f67990ea73b2951f74b901c06918beee16a
section_end:1542386407:get_sources
section_start:1542386407:upload_artifacts_on_failure
section_end:1542386408:upload_artifacts_on_failure
ERROR: Job failed: exit code 1