I got this TS Error, can anyone explain me what I am doing wrong ?

Type '{ key: string; number: number | undefined; }[]' is not assignable to type 'IReviewsRoute[]'.
  Type '{ key: string; number: number | undefined; }' is not assignable to type 'IReviewsRoute'.
    Types of property 'key' are incompatible.
      Type 'string' is not assignable to type 'ReviewsKeyType'.ts(2322)

Model:

export type ReviewsKeyType = 'ONE' | 'TWO' | 'THREE' | 'FOUR' | 'FIVE';

export interface IReviewsRoute {
  key: ReviewsKeyType;
  number: number | undefined;
}

Data

    const ROUTES: IReviewsRoute[] = [
      {
        key: 'ONE',
        number: 1
      },
      {
        key: 'TWO',
        number: 2
      },
      {
        key: 'THREE',
        number: 3
      },
      {
        key: 'FOUR',
        number: 4
      },
      {
        key: 'FIVE',
        number: 5
      }
    ];

Why he say string is not assignagble to type reviewskeytpe ? I didnt put a string anywhere