问在App.tsx中注册Vant的ActionSheet组件出现问题？

import { Vue, Component } from 'vue-property-decorator'
import { ActionSheet } from 'vant'
@Component({
    components: { ActionSheet }
})
export default class App extends Vue {
    private render() {
        return (<div id="app">
            <ActionSheet> /* 静态元素*/</ActionSheet>
        </div>)
    }
}

[Vue warn]: Invalid component name: “_Ctor”. Component names should conform to valid custom element name in html5 specification.