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# errorHealthDataUnavailable

The user accessed HealthKit on an unsupported device.

```
static var errorHealthDataUnavailable: HKError.Code { get }
```

## Discussion

Because iOS apps can run on devices that don’t support HealthKit (for example, on an iPad), always verify that the current device supports HealthKit by calling [`isHealthDataAvailable()`](/documentation/HealthKit/HKHealthStore/isHealthDataAvailable()) before calling any other HealthKit methods. If HealthKit isn’t available on the device, other HealthKit methods fail with an [`errorHealthDataUnavailable`](/documentation/HealthKit/HKError/errorHealthDataUnavailable) error.

---

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