Redux store does not have a valid reducer
Your import statement is incorrect. Either you use import { Foo } from 'bar' together with export Foo, or use import Foo from 'bar' if you export with export default Foo.
In other words, change either export default function FriendListReducer to export function FriendListReducer, or change the import statement from import { FriendListReducer } to import FriendListReducer.
../reducers/reducers ? it's a strange naming
Anyway, it seems ../reducers/reducers doesn't return a reducer, if reducers is a directory, put a index.js inside, import each reducer and create a root reducer
import FriendListReducer from "./FriendListReducer"const rootReducer = combineReducers({ friendList : FriendListReducer})export default rootReducerImportant!! you will have state.friendList in your state.
I hope it will help