vuex-persistedstate。报toJSON未定义错误。

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在我使用以下方法后。

import persistedState from 'vuex-persistedstate'
export default new Vuex.Store({
    // ...
    plugins: [persistedState()]
})

报错

vue.esm.js?efeb:628 [Vue warn]: Property or method “toJSON” is not defined on the instance but referenced during render. Make sure that this property is reactive, either in the data option, or for class-based components, by initializing the property.