# IErrorCallbacksAn extended version of the [ICallbacks](./reference-icallbacks.md), which get invoked if the test run fails due to a build error or if any [IPrebuildSetup](./reference-setup-and-cleanup.md) has a failure.## Public methods| Syntax | Description || ---------------------------- | ------------------------------------------------------------------- || void OnError(string message) | The error message detailing the reason for the run to fail. |