Async function and promise into promise

Ionic Framework ionic-v3
1

I have the following code:

 private async getInitialPosition(): Promise<any> {
    await this.fetchFloors();
    console.log("PAPAPA")
  }

  private fetchFloors(): Promise<any> {
    return new Promise(async () => {
      await this.platform.ready().then(async () => {
        await cordova.plugins.Situm.fetchFloorsFromBuilding(this.building, res => {
          this.floors = res;
          console.log("PLANTAS")
          console.log(this.floors)
        }, () => console.log("ERROR"));
        Promise.resolve();
      });
      Promise.resolve();
    })
  }

But ‘PAPAPA’ is showing before ‘PLANTAS’

Why is this? What’s wrong with this code?

Thanks!