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You're using the 3.x-dev version of Corolla, which is not quite ready for release.  You should consider using the stable 2.x release instead.

To fix the error, you will need to go the Corolla theme administration page (/admin/appearance/settings/corolla) and choose either "mobile first" or "desktop first" under "CSS Global Settings."

P.S.  In the future, this type of theme-specific question should be filed as a "Support request" in the Corolla issue queue.