我是redux的新手，我创建了一个名为eventmodalSlice的切片，用来跟踪应用程序中的模态是打开还是关闭的。

类型错误：undefined不是对象（评估'state. eventmodal'）

import React from "react"
import { createSlice } from "@reduxjs/toolkit"

export const eventmodalSlice = createSlice({
    name: "eventmodal",
    initialState:{
        modalvisible: null
    },

    reducers: {
        Close: (state, action) => {
            state.modalvisible = action.payload;
        },

        Open: (state, action) => {
            state.modalvisible = action.payload;
        },

    }
});

export const  {Close, Open} = eventmodalSlice.actions;
export const selectEventModal = (state) => state.eventmodal.modalvisible;
export default eventmodalSlice.reducer;

我不确定是什么原因导致了这个特定的切片中的错误，因为我有另一个切片称为用户切片，它看起来几乎与这个切片相同。

import React from "react"
import { createSlice } from "@reduxjs/toolkit"
import { act } from "react-test-renderer";

export const userSlice = createSlice({
    name: "user",
    initialState:{
        user: null
    },

    reducers: {
        Signin: (state, action) => {
            state.user = action.payload;
        },

        Register: (state, action) => {
            state.user = action.payload;
        },

        Signout: (state) => {
            state.user = null;
        }
    }
});

export const  { Signin, Register, Signout} = userSlice.actions;

export const selectUser = (state) => state.user.user;

export default userSlice.reducer;

State.user.user在最后一个代码段中没有错误。这是最令人困惑的地方，因为这些代码段看起来几乎一样，除非我遗漏了什么。如果有任何帮助，我们将不胜感激。

我的商店看起来像这样

import { configureStore } from "@reduxjs/toolkit";
import userReducer from "./userSlice"
import eventmodalReducer from "./eventmodalSlice"

export default configureStore({
    reducer: {
        user: userReducer,
        eventmodal: eventmodalReducer
    },
});