我正在使用離子可選包github進(jìn)行產(chǎn)品選擇。在組件中打開 IonicSelectable 之前，我在控制臺(tái)中遇到錯(cuò)誤。ERROR Error: Uncaught (in promise): overlay does not exist    at resolvePromise (zone.js:831)    at zone.js:741    at rejected (tslib.es6.js:71)    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:391)    at Object.onInvoke (core.js:17299)    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke (zone.js:390)    at Zone.push../node_modules/zone.js/dist/zone.js.Zone.run (zone.js:150)    at zone.js:889    at ZoneDelegate.push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask (zone.js:423)    at Object.onInvokeTask (core.js:17290)我不明白提出這個(gè)問題的問題是什么。我已經(jīng)按照說明中的說明使用了該軟件包，例如app.module.tsimport { IonicSelectableModule } from 'ionic-selectable';@NgModule({  imports: [    IonicSelectableModule  ]})export class AppModule { }在像這樣的延遲加載模塊中import { IonicSelectableModule } from 'ionic-selectable';import { HomePage } from './home';@NgModule({  declarations: [    HomePage  ],  imports: [    IonicPageModule.forChild(HomePage),    IonicSelectableModule  ]})export class HomePageModule { }