Error during startup on Windows 7

[example6]

The following error is encountered when startup on Windows 7:

C:\dsa>dart-sdk\bin\dart.exe dslinks\dslink-dart-system\bin\r
un.dart --broker http://localhost:8080/conn
[WARNING][DSA] Error in statistic updater.
[WARNING][DSA] RangeError (index): Invalid value: Only valid value is 0: 1
[WARNING][DSA] #0 List.[] (dart:core-patch/growable_array.dart:148)
[WARNING][DSA] #1 getDiskUsage.<getDiskUsage_async_body>.getBytesFor (file:
///C:/dsa/dslinks/dslink-dart-system/bin/run.dart:8530:43)
[WARNING][DSA] #2 getDiskUsage.<getDiskUsage_async_body> (file:///C:/dsa/ds
links/dslink-dart-system/bin/run.dart:8532:30)
[WARNING][DSA] #3 _RootZone.runUnary (dart:async/zone.dart:1204)
[WARNING][DSA] #4 _FutureListener.handleValue (dart:async/future_impl.dart:
131)
[WARNING][DSA] #5 _Future._propagateToListeners.handleValueCallback (dart:a
sync/future_impl.dart:637)
[WARNING][DSA] #6 _Future._propagateToListeners (dart:async/future_impl.dar
t:667)
[WARNING][DSA] #7 _Future._completeWithValue (dart:async/future_impl.dart:4
77)
[WARNING][DSA] #8 Future.wait. (dart:async/future.dart:2
99)
[WARNING][DSA] #9 _RootZone.runUnary (dart:async/zone.dart:1204)
[WARNING][DSA] #10 _FutureListener.handleValue (dart:async/future_impl.dart:
131)
[WARNING][DSA] #11 _Future._propagateToListeners.handleValueCallback (dart:a
sync/future_impl.dart:637)
[WARNING][DSA] #12 _Future._propagateToListeners (dart:async/future_impl.dar
t:667)
[WARNING][DSA] #13 _Future._completeWithValue (dart:async/future_impl.dart:4
77)
[WARNING][DSA] #14 _Future._asyncComplete. (dart:async/fu
ture_impl.dart:528)
[WARNING][DSA] #15 _microtaskLoop (dart:async/schedule_microtask.dart:41)
[WARNING][DSA] #16 _startMicrotaskLoop (dart:async/schedule_microtask.dart:5
0)
[WARNING][DSA] #17 runPendingImmediateCallback (dart:isolate-patch/isolate
patch.dart:96)
[WARNING][DSA] #18 _RawReceivePortImpl._handleMessage (dart:isolate-patch/is
olate_patch.dart:149)
[INFO][DSA] Connecting to http://localhost:8080/conn
[INFO][DSA] Connected