Redis result backend KeyError: 'backend' Unrecoverable error: SyntaxError('invalid syntax', ...) · Issue #5049 · celery/celery

Checklist software -> celery:4.2.1 (windowlicker) kombu:4.2.1 py:3.7.0 billiard:3.5.0.4 redis:2.10.6 platform -> system:Darwin arch:64bit imp:CPython loader -> celery.loaders.app.AppLoader settings...