React-Native Healthkit getSleepSamples SleepData

I have been trying to get sleep data from the health app using react native. I have been able to get the step count, but haven't been able to get the sleep data.

here is my code

AppleHealthKit.initHealthKit(options: Object, (err: string, results: Object) => {
  if (err) {
      console.log("error initializing Healthkit: ", err);
      return;
  }   
AppleHealthKit.getSleepSamples(options, (err: Object, results: Array<Object>) => {
  if (err) {
    console.log(err);
    return;
  }
  this.setState({sleep:results.value})
});

debugging exception :

{message: "error getting sleep samples"}