Adding a helpful error message to point users to fixing the could not… #1129

Job	Run time
check_format	1m 11s
specs (shard.yml, 14, 1.10.0, false)	3m 41s
specs (shard.yml, 14, latest, false)	3m 29s
specs (shard.yml, 15, 1.10.0, false)	3m 45s
specs (shard.yml, 15, latest, false)	3m 57s
specs (shard.yml, 16, 1.10.0, false)	3m 46s
specs (shard.yml, 16, latest, false)	3m 44s
specs (shard.edge.yml, latest, 14, true)	4m 0s
specs (shard.override.yml, nightly, 14, true)	3m 19s
	30m 52s

Provide feedback