Class	ApplicationErrorCategory	Severity category for your application error. Maps to corresponding client-side logging/metrics behaviors
Class	RetryState	Current retry state of the workflow/activity during error.
Class	TimeoutType	Type of timeout for TimeoutError.
Exception	ActivityAlreadyStartedError	Thrown by a client when an activity execution has already started.
Exception	ActivityError	Error raised on activity failure.
Exception	ApplicationError	Error raised during workflow/activity execution.
Exception	CancelledError	Error raised on workflow/activity cancellation.
Exception	ChildWorkflowError	Error raised on child workflow failure.
Exception	FailureError	Base for runtime failures during workflow/activity execution.
Exception	NexusOperationError	Error raised on Nexus operation failure inside a Workflow.
Exception	ServerError	Error originating in the Temporal server.
Exception	TemporalError	Base for all Temporal exceptions.
Exception	TerminatedError	Error raised on workflow cancellation.
Exception	TimeoutError	Error raised on workflow/activity timeout.
Exception	WorkflowAlreadyStartedError	Thrown by a client or workflow when a workflow execution has already started.
Function	is_cancelled_exception	Check whether the given exception is considered a cancellation exception according to Temporal.