使用UIAbilityContext的时候，报401 “The context must be a valid Context”的Context类型错误

import { AbilityConstant, UIAbility, Want } from '@kit.AbilityKit';
export default class EntryAbility extends UIAbility {
  onCreate(want: Want, launchParam: AbilityConstant.LaunchParam) {
    let uiAbilityContext = this.context;
    // ...
  }
}
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