There were test failures. When it happened, it seemed that it failed to get a screenshot. https://treeherder.mozilla.org/#/jobs?repo=try&revision=9733f93205ba567cc89ab41d21b3be59f46ae798
Bug 1585619 Comment 5 Edit History
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There were test failures. When it happened, it seemed that it failed to get a screenshot. https://treeherder.mozilla.org/#/jobs?repo=try&revision=4ff279ed422c09586724d6c8019e7ad7a75a1ca6