<Provider> does not support changing `store` on the fly. It is most likely that you see this error because you updated to Redux 2.x and React Redux 2.x which no longer hot reload reducers automatically. See https://github.com/rackt/react-redux/releases/tag/v2.0.0 for the migration instructions.

https://github.com/reactjs/redux/commit/80197eff76a1784eb29120fd7e8817b1e56b88a7#commitcomment-15303519