Error: Object literal may only specify known properties

[itshazlan]

Hi, your project is awesome and I want to test it, but it give me an error like this ::
Argument of type '{ id: number; text: string; at: Date; led: "FF0000"; sound: string; }' is not assignable
to parameter of type 'ILocalNotification | ILocalNotification[]'. Object literal may only specify known
properties, and 'at' does not exist in type 'ILocalNotification | ILocalNotification[]'.

  L41:  text: 'Delayed ILocalNotification',
  L42:  at: date,
  L43:  led: 'FF0000',

Hope you help me out, thank you.