前言

略

错误

错误原因

theme-picker 组件未被注册。

解决

src/App.vue代码恢复成若依的代码即可。（PS：不知道代码被谁修改了）

缺少这一段：

<script>
import ThemePicker from "@/components/ThemePicker";

export default {
  name: "App",
  components: { ThemePicker },
    metaInfo() {
        return {
            title: this.$store.state.settings.dynamicTitle && this.$store.state.settings.title,
            titleTemplate: title => {
                return title ? `${title} - ${process.env.VUE_APP_TITLE}` : process.env.VUE_APP_TITLE
            }
        }
    }
};
</script>