A non-serializable value was detected in an action, in th e path" 'register'.

https://github.com/rt2zz/redux-persist/issues/988

non-serializable value error · Issue #988 · rt2zz/redux-persist

원인 설명이 잘 되어 있다.

<해결 예시>

 오류 코드)

const store = configureStore({
  reducer: rootReducer,
  middleware: [...getDefaultMiddleware(), sagaMiddleware ]
});

 해결 코드)

const store = configureStore({
  reducer: rootReducer,
  middleware: [ sagaMiddleware ]
});

...getDefaultMiddleware()를 제거해준다.