there are two classes ( I created new instance from first class in main class )

TypeError: Cannot read property 'first1' of undefined

export default class main {
  first1: first
  constructor() {
    this.first1 = new first()
  } 
  async list(req: Request, res: Response, next: NextFunction) {
    try {
      const { result } = await this.first1.list({ limit: req.query.limit, page: 
                         req.query.page, filters: req.query.filters })
      res.status(200).json(result)
    } catch (error) {
      console.log(error)
      CatchError(error, next)
    }
  }
}

export default class first{

  async list({ limit, page, filters }) {
    let result: {data:"ssssssss"}
    return { result }
  }

}