Updated error message, now it's more helpful to the end user
Updated error message, now it's more helpful to the end user


Former-commit-id: 8c6a0463b869529bb29b99f08613228d66c87ad4 [formerly 8c6a0463b869529bb29b99f08613228d66c87ad4 [formerly 96cdb97a61166a8d028f80061d892848efa3360f]]
Former-commit-id: 71a62e7c0a90ae28482b6d1b9f37f8a29ebd9213
Former-commit-id: 226596011ff5cba68421d19e2159c37274e2a838
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine