11:39:19 PM: Build ready to start
11:40:02 PM: build-image version: 59029cc38debec12b365d8cde2431251b878d6bf (focal)
11:40:02 PM: buildbot version: e06c8b12db8d11e7b1884ff05239b221ef25f172
11:40:02 PM: Fetching cached dependencies
11:40:02 PM: Starting to download cache of 414.3MB
11:40:04 PM: Finished downloading cache in 2.173s
11:40:04 PM: Starting to extract cache
11:40:10 PM: Finished extracting cache in 6.148s
11:40:10 PM: Finished fetching cache in 8.408s
11:40:11 PM: Failed during stage 'preparing repo': git ref pull/337/head does not exist
11:40:11 PM: Starting to prepare the repo for build
11:40:11 PM: git ref pull/337/head does not exist or you do not have permission
11:40:11 PM: Failing build: Failed to prepare repo