Improved error message [skip CI]
Improved error message [skip CI]


Former-commit-id: 2d337693550f8d6622d948433dacad84db25d4d5 [formerly 003a8bf393eb254fc1034351fc13956ad56c0ca8]
Former-commit-id: 8c084080e84161422c77292c380c5618b97e5eed
gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine,gem/oq-engine