# addError method

void addError (Object error, [ StackTrace stackTrace ])

Sends or enqueues an error event.

If `error` is `null`, it is replaced by a NullThrownError.

Listeners receive this event at a later microtask. This behavior can be overridden by using `sync` controllers. Note, however, that sync controllers have to satisfy the preconditions mentioned in the documentation of the constructors.

## Implementation

    void addError(Object error, [StackTrace stackTrace]);