当我从最深的视图导航到下一个父视图时，我收到以下错误消息：'package:angular/core/scope.dart': Failed assertion: line 297 pos 12: 'isAttached' is not true.
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上述错误是什么意思？我的路由器定义是否有任何错误？可能是<ng-view></ng-view>在深层嵌套视图中的位置吗？
如何重现此错误条件：
导航到最深的路线，即一直到子视图之一，如屏幕截图所示[1] [https://onedrive.live.com/embed?cid=CCCEB2154F3BF15A&resid= ！CCCEB2154F3BF15A 869＆安培; AUTHKEY = AJQ-1hF_KUVNsYM]
现在，尝试导航到View2（即到下一个父视图），如屏幕截图-2所示[https://onedrive.live.com/embed?cid=CCCEB2154F3BF15A&resid=CCCEB2154F3BF15A ！868＆安培; AUTHKEY = AEZyo3s7A-el880]
以上两个步骤应该产生以下错误转储：
'package:angular/core/scope.dart': Failed assertion: line 297 pos 12: 'isAttached' is not true.
STACKTRACE:
#0 Scope.destroy (package:angular/core/scope.dart:297:12)
#1 NgViewDirective._cleanUp (package:angular/routing/ng_view.dart:132:19)
#2 NgViewDirective._show.<anonymous closure> (package:angular/routing/ng_view.dart:108:15)
#3 _rootRunUnary (dart:async/zone.dart:717)
#4 _ZoneDelegate.runUnary (dart:async/zone.dart:449)
#5 _onRunUnary.<anonymous closure> (package:angular/core/zone.dart:70:61)
#6 NgZone._onRunBase (package:angular/core/zone.dart:54:16)
#7 _onRunUnary (package:angular/core/zone.dart:70:15)
#8 _ZoneDelegate.runUnary (dart:async/zone.dart:449)
#9 _CustomizedZone.runUnary (dart:async/zone.dart:654)
#10 _BaseZone.runUnaryGuarded (dart:async/zone.dart:569)
#11 _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:333)
#12 _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263)
#13 _SyncBroadcastStreamController._sendData.<anonymous closure> (dart:async/broadcast_stream_controller.dart:345)
#14 _BroadcastStreamController._forEachListener (dart:async/broadcast_stream_controller.dart:298)
#15 _SyncBroadcastStreamController._sendData (dart:async/broadcast_stream_controller.dart:344)
#16 _BroadcastStreamController.add (dart:async/broadcast_stream_controller.dart:228)
#17 Router._leaveCurrentRouteHelper (package:route_hierarchical/client.dart:630:48)
#18 Router._leaveCurrentRouteHelper (package:route_hierarchical/client.dart:632:46)
#19 Router._leaveCurrentRoute (package:route_hierarchical/client.dart:621:43)
#20 Router._leaveOldRoutes (package:route_hierarchical/client.dart:504:30)
#21 Router._processNewRoute (package:route_hierarchical/client.dart:484:27)
#22 Router._route.<anonymous closure> (package:route_hierarchical/client.dart:468:29)
#23 _rootRunUnary (dart:async/zone.dart:717)
#24 _ZoneDelegate.runUnary (dart:async/zone.dart:449)
#25 _onRunUnary.<anonymous closure> (package:angular/core/zone.dart:70:61)
#26 NgZone._onRunBase (package:angular/core/zone.dart:54:16)
#27 _onRunUnary (package:angular/core/zone.dart:70:15)
#28 _ZoneDelegate.runUnary (dart:async/zone.dart:449)
#29 _CustomizedZone.runUnary (dart:async/zone.dart:654)
#30 _Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:439)
#31 _Future._propagateToListeners (dart:async/future_impl.dart:522)
#32 _Future._complete (dart:async/future_impl.dart:303)
#33 _Future._asyncComplete.<anonymous closure> (dart:async/future_impl.dart:354)
#34 _rootRun (dart:async/zone.dart:706)
#35 _ZoneDelegate.run (dart:async/zone.dart:440)
#36 _onScheduleMicrotask.<anonymous closure> (package:angular/core/zone.dart:74:39)
#37 _rootRun (dart:async/zone.dart:710)
#38 _ZoneDelegate.run (dart:async/zone.dart:440)
#39 NgZone._finishTurn (package:angular/core/zone.dart:94:23)
#40 NgZone._onRunBase (package:angular/core/zone.dart:61:43)
#41 _onRunUnary (package:angular/core/zone.dart:70:15)
#42 _ZoneDelegate.runUnary (dart:async/zone.dart:449)
#43 _CustomizedZone.runUnary (dart:async/zone.dart:654)
#44 _BaseZone.runUnaryGuarded (dart:async/zone.dart:569)
#45 _BaseZone.bindUnaryCallback.<anonymous closure> (dart:async/zone.dart:595)
飞镖版：
Dart Editor version 1.2.0.release (STABLE)
Dart SDK version 1.2.0
开发机器：
Manjaro Linux 0.8.9 64-bit
Linux kernel 3.10.36-1-MANJARO
(Note! Manjaro Linux is an Arch Linux based distro)