---
title: HKError.Code.errorAnotherWorkoutSessionStarted
framework: healthkit
role: symbol
role_heading: Case
path: healthkit/hkerror/code/erroranotherworkoutsessionstarted
---

# HKError.Code.errorAnotherWorkoutSessionStarted

Another app started a workout session.

## Declaration

```swift
case errorAnotherWorkoutSessionStarted
```

## Discussion

Discussion This error occurs whenever a second workout session is started. Apple Watch only runs one workout session at a time. If the user begins a second workout session in a different app, the original session receives this error message and then ends. The second session then starts.

## See Also

### Errors

- [HKError.Code.errorHealthDataUnavailable](healthkit/hkerror/code/errorhealthdataunavailable.md)
- [HKError.Code.errorHealthDataRestricted](healthkit/hkerror/code/errorhealthdatarestricted.md)
- [HKError.Code.errorInvalidArgument](healthkit/hkerror/code/errorinvalidargument.md)
- [HKError.Code.errorAuthorizationDenied](healthkit/hkerror/code/errorauthorizationdenied.md)
- [HKError.Code.errorAuthorizationNotDetermined](healthkit/hkerror/code/errorauthorizationnotdetermined.md)
- [HKError.Code.errorRequiredAuthorizationDenied](healthkit/hkerror/code/errorrequiredauthorizationdenied.md)
- [HKError.Code.errorDatabaseInaccessible](healthkit/hkerror/code/errordatabaseinaccessible.md)
- [HKError.Code.errorUserCanceled](healthkit/hkerror/code/errorusercanceled.md)
- [HKError.Code.errorUserExitedWorkoutSession](healthkit/hkerror/code/erroruserexitedworkoutsession.md)
- [HKError.Code.errorNoData](healthkit/hkerror/code/errornodata.md)