# errorZone property

Zone errorZone

The error zone is the one that is responsible for dealing with uncaught errors.

This is the closest parent zone of this zone that provides a handleUncaughtError method.

Asynchronous errors never cross zone boundaries between zones with different error handlers.

Example:

    import 'dart:async';

    main() {
      var future;
      runZoned(() {
        // The asynchronous error is caught by the custom zone which prints
        // 'asynchronous error'.
        future = new Future.error("asynchronous error");
      }, onError: (e) { print(e); });  // Creates a zone with an error handler.
      // The following `catchError` handler is never invoked, because the
      // custom zone created by the call to `runZoned` provides an
      // error handler.
      future.catchError((e) { throw "is never reached"; });
    }

Note that errors cannot enter a child zone with a different error handler either:

    import 'dart:async';

    main() {
      runZoned(() {
        // The following asynchronous error is *not* caught by the `catchError`
        // in the nested zone, since errors are not to cross zone boundaries
        // with different error handlers.
        // Instead the error is handled by the current error handler,
        // printing "Caught by outer zone: asynchronous error".
        var future = new Future.error("asynchronous error");
        runZoned(() {
          future.catchError((e) { throw "is never reached"; });
        }, onError: (e) { throw "is never reached"; });
      }, onError: (e) { print("Caught by outer zone: $e"); });
    }

## Implementation

    Zone get errorZone;