Description

This class is used to report an error when using Progress.RunTask(...).

[MenuItem("Progress/Run Task With Error", priority = 25)]
static void RunTaskWithError()
{
    Progress.RunTask("Task With Error", null, (id, data) => TaskWithError());
}

static IEnumerator TaskWithError()
{
    for (var i = 0; i < 100; ++i)
    {
        yield return WaitForSeconds(0.1f);
        if (i < 75)
            yield return new Progress.TaskReport(i / 100.0f);
        else
            yield return new Progress.TaskError("Forcing an error when reaching 75%.");
    }
}

Additional resources: Progress.Progress.