how to add redux-form? about next-postgres-sequelize HOT 4 CLOSED

import { createStore, combineReducers } from 'redux';
import { reducer as formReducer } from 'redux-form';

const reducers = {
  // ... your other reducers here ...
  form: formReducer
};
const reducer = combineReducers(reducers);
const store = createStore(reducer);

Unexpected keys "post", "users", "posts", "comments", "isAuthenticated", "viewer" found in preloadedState argument passed to createStore. Expected to find one of the known reducer keys instead: "form". Unexpected keys will be ignored.
TypeError: Cannot read property 'length' of undefined

const mergeLogoutState = state => {
  return { ...state, isAuthenticated: false, viewer: undefined };
};

const myReducer = (state = INITIAL_STATE, action) => {
  switch (action.type) {
    case 'UPDATE_STORE_KEYS':
      return mergeUpdatedKeys(action.data, state);
    case 'VIEWER_AUTHENTICATED':
      return mergeAuthState(action, state);
    case 'VIEWER_LOGOUT':
      return mergeLogoutState(state);
    default:
      return state;
  }
};
const reducers = {
      myReducer,
    form: formReducer
};
const reducer = combineReducers(reducers);

export const initStore = initialState => {
  return createStore(reducer, initialState, applyMiddleware(thunkMiddleware));
};

static async getInitialProps(ctx) {
        return ctx ? { isAuthenticated : ctx.req.isAuthenticated() , currentUser : ctx.req.user }: { isAuthenticated : null}

    }