google app engine - How to manually delete local gcloud Dart DB? -

i running simple code

db.query(sampletype).run().tolist(); 

and getting error. when query types don't error, other do. seems i've populated db , updated types , query won't decode. haven't tried using filter, if use lookup known entity work, using command erase sampletypes db, stuck undesired damaged entities. how manually erase db? starters, local db reside?

here actuall error

bad state: error while decoding entity (illegal argument(s): type argument must not null., #0      key.key (package:gcloud/src/db/models.dart:22:7) #1      key.append (package:gcloud/src/db/models.dart:55:16) #2      modeldbimpl.fromdatastorekey (package:gcloud/src/db/model_db_impl.dart:65:23) #3      modelkeyproperty.decodeprimitivevalue (package:gcloud/src/db/annotations.dart:179:31) #4      listproperty.decodeprimitivevalue (package:gcloud/src/db/annotations.dart:268:65) #5      _modeldescription._decodeproperty (package:gcloud/src/db/model_db_impl.dart:427:42) #6      _modeldescription.decodeentity. (package:gcloud/src/db/model_db_impl.dart:416:22) #7      _hashmap&&_linkedhashmapmixin.foreach (dart:collection-patch/collection_patch.dart:967) #8      _modeldescription.decodeentity (package:gcloud/src/db/model_db_impl.dart:415:41) #9      fromdatastoreentity (package:gcloud/src/db/model_db_impl.dart:124:43) #10     _mapstream._handledata (dart:async/stream_pipe.dart:233) #11     _handledata (dart:async/stream_pipe.dart:170) #12     _rootrununary (dart:async/zone.dart:899) #13     _customzone.rununary (dart:async/zone.dart:801) #14     _customzone.rununaryguarded (dart:async/zone.dart:709) #15     _bufferingstreamsubscription._senddata (dart:async/stream_impl.dart:341) #16     _bufferingstreamsubscription._add (dart:async/stream_impl.dart:270) #17     _streamcontroller&&_syncstreamcontrollerdispatch._senddata (dart:async/stream_controller.dart:587) #18     _streamcontroller._add (dart:async/stream_controller.dart:462) #19     add (dart:async/stream_controller.dart:410) #20     list.foreach (dart:core-patch/growable_array.dart:254) #21     _handlepage (package:gcloud/common.dart:58:23) #22     _rootrununary (dart:async/zone.dart:899) #23     _customzone.rununary (dart:async/zone.dart:801) #24     _future._propagatetolisteners.handlevaluecallback (dart:async/future_impl.dart:496) #25     _future._propagatetolisteners (dart:async/future_impl.dart:579) #26     _future._complete (dart:async/future_impl.dart:325) #27     stream.fold. (dart:async/stream.dart:541) #28     _rootrun (dart:async/zone.dart:888) #29     _customzone.run (dart:async/zone.dart:793) #30     _customzone.runguarded (dart:async/zone.dart:701) #31     _bufferingstreamsubscription._senddone.senddone (dart:async/stream_impl.dart:390) #32     _bufferingstreamsubscription._senddone (dart:async/stream_impl.dart:399) #33     _bufferingstreamsubscription._close (dart:async/stream_impl.dart:290) #34     _forwardingstream._handledone (dart:async/stream_pipe.dart:110) #35     _handledone (dart:async/stream_pipe.dart:178) #36     _rootrun (dart:async/zone.dart:888) #37     _customzone.run (dart:async/zone.dart:793) #38     _customzone.runguarded (dart:async/zone.dart:701) #39     _bufferingstreamsubscription._senddone.senddone (dart:async/stream_impl.dart:390) #40     _bufferingstreamsubscription._senddone (dart:async/stream_impl.dart:399) #41     _delayeddone.perform (dart:async/stream_impl.dart:614) #42     _streamimplevents.handlenext (dart:async/stream_impl.dart:711) #43     _pendingevents.schedule. (dart:async/stream_impl.dart:671) #44     _rootrun (dart:async/zone.dart:888) #45     _customzone.run (dart:async/zone.dart:793) #46     _customzone.runguarded (dart:async/zone.dart:701) #47     _customzone.bindcallback. (dart:async/zone.dart:726) #48     _rootrun (dart:async/zone.dart:892) #49     _customzone.run (dart:async/zone.dart:793) #50     _customzone.runguarded (dart:async/zone.dart:701) #51     _customzone.bindcallback. (dart:async/zone.dart:726) #52     _asyncruncallbackloop (dart:async/schedule_microtask.dart:41) #53     _asyncruncallback (dart:async/schedule_microtask.dart:48) #54     _runpendingimmediatecallback (dart:isolate-patch/isolate_patch.dart:84) #55     _rawreceiveportimpl._handlemessage (dart:isolate-patch/isolate_patch.dart:131) ).  package:gcloud/src/db/model_db_impl.dart 126:7  fromdatastoreentity dart:core                                       list.foreach package:gcloud/common.dart 58:23                _handlepage dart:isolate                                    _rawreceiveportimpl._handlemessage #7      _hashmap&&_linkedhashmapmixin.foreach (dart:collection-patch/collection_patch.dart:967) #8      _modeldescription.decodeentity (package:gcloud/src/db/model_db_impl.dart:415:41) #9      fromdatastoreentity (package:gcloud/src/db/model_db_impl.dart:124:43) #10     _mapstream._handledata (dart:async/stream_pipe.dart:233) #11     _handledata (dart:async/stream_pipe.dart:170) #12     _rootrununary (dart:async/zone.dart:899) #13     _customzone.rununary (dart:async/zone.dart:801) #14     _customzone.rununaryguarded (dart:async/zone.dart:709) #15     _bufferingstreamsubscription._senddata (dart:async/stream_impl.dart:341) #16     _bufferingstreamsubscription._add (dart:async/stream_impl.dart:270) #17     _streamcontroller&&_syncstreamcontrollerdispatch._senddata (dart:async/stream_controller.dart:587) #18     _streamcontroller._add (dart:async/stream_controller.dart:462) #19     add (dart:async/stream_controller.dart:410) #20     list.foreach (dart:core-patch/growable_array.dart:254) #21     _handlepage (package:gcloud/common.dart:58:23) #22     _rootrununary (dart:async/zone.dart:899) #23     _customzone.rununary (dart:async/zone.dart:801) #24     _future._propagatetolisteners.handlevaluecallback (dart:async/future_impl.dart:496) #25     _future._propagatetolisteners (dart:async/future_impl.dart:579) #26     _future._complete (dart:async/future_impl.dart:325) #27     stream.fold. (dart:async/stream.dart:541) #28     _rootrun (dart:async/zone.dart:888) #29     _customzone.run (dart:async/zone.dart:793) #30     _customzone.runguarded (dart:async/zone.dart:701) #31     _bufferingstreamsubscription._senddone.senddone (dart:async/stream_impl.dart:390) #32     _bufferingstreamsubscription._senddone (dart:async/stream_impl.dart:399) #33     _bufferingstreamsubscription._close (dart:async/stream_impl.dart:290) #34     _forwardingstream._handledone (dart:async/stream_pipe.dart:110) #35     _handledone (dart:async/stream_pipe.dart:178) #36     _rootrun (dart:async/zone.dart:888) #37     _customzone.run (dart:async/zone.dart:793) #38     _customzone.runguarded (dart:async/zone.dart:701) #39     _bufferingstreamsubscription._senddone.senddone (dart:async/stream_impl.dart:390) #40     _bufferingstreamsubscription._senddone (dart:async/stream_impl.dart:399) #41     _delayeddone.perform (dart:async/stream_impl.dart:614) #42     _streamimplevents.handlenext (dart:async/stream_impl.dart:711) #43     _pendingevents.schedule. (dart:async/stream_impl.dart:671) #44     _rootrun (dart:async/zone.dart:888) #45     _customzone.run (dart:async/zone.dart:793) #46     _customzone.runguarded (dart:async/zone.dart:701) #47     _customzone.bindcallback. (dart:async/zone.dart:726) #48     _rootrun (dart:async/zone.dart:892) #49     _customzone.run (dart:async/zone.dart:793) #50     _customzone.runguarded (dart:async/zone.dart:701) #51     _customzone.bindcallback. (dart:async/zone.dart:726) #52     _asyncruncallbackloop (dart:async/schedule_microtask.dart:41) #53     _asyncruncallback (dart:async/schedule_microtask.dart:48) #54     _runpendingimmediatecallback (dart:isolate-patch/isolate_patch.dart:84) #55     _rawreceiveportimpl._handlemessage (dart:isolate-patch/isolate_patch.dart:131) ).  package:gcloud/src/db/model_db_impl.dart 126:7  fromdatastoreentity dart:core                                       list.foreach package:gcloud/common.dart 58:23                _handlepage dart:isolate                                    _rawreceiveportimpl._handlemessage #28     _rootrun (dart:async/zone.dart:888) #29     _customzone.run (dart:async/zone.dart:793) #30     _customzone.runguarded (dart:async/zone.dart:701) #31     _bufferingstreamsubscription._senddone.senddone (dart:async/stream_impl.dart:390) #32     _bufferingstreamsubscription._senddone (dart:async/stream_impl.dart:399) #33     _bufferingstreamsubscription._close (dart:async/stream_impl.dart:290) #34     _forwardingstream._handledone (dart:async/stream_pipe.dart:110) #35     _handledone (dart:async/stream_pipe.dart:178) #36     _rootrun (dart:async/zone.dart:888) #37     _customzone.run (dart:async/zone.dart:793) #38     _customzone.runguarded (dart:async/zone.dart:701) #39     _bufferingstreamsubscription._senddone.senddone (dart:async/stream_impl.dart:390) #40     _bufferingstreamsubscription._senddone (dart:async/stream_impl.dart:399) #41     _delayeddone.perform (dart:async/stream_impl.dart:614) #42     _streamimplevents.handlenext (dart:async/stream_impl.dart:711) #43     _pendingevents.schedule. (dart:async/stream_impl.dart:671) #44     _rootrun (dart:async/zone.dart:888) #45     _customzone.run (dart:async/zone.dart:793) #46     _customzone.runguarded (dart:async/zone.dart:701) #47     _customzone.bindcallback. (dart:async/zone.dart:726) #48     _rootrun (dart:async/zone.dart:892) #49     _customzone.run (dart:async/zone.dart:793) #50     _customzone.runguarded (dart:async/zone.dart:701) #51     _customzone.bindcallback. (dart:async/zone.dart:726) #52     _asyncruncallbackloop (dart:async/schedule_microtask.dart:41) #53     _asyncruncallback (dart:async/schedule_microtask.dart:48) #54     _runpendingimmediatecallback (dart:isolate-patch/isolate_patch.dart:84) #55     _rawreceiveportimpl._handlemessage (dart:isolate-patch/isolate_patch.dart:131) ).  package:gcloud/src/db/model_db_impl.dart 126:7  fromdatastoreentity dart:core                                       list.foreach package:gcloud/common.dart 58:23                _handlepage dart:isolate                                    _rawreceiveportimpl._handlemessage #44     _rootrun (dart:async/zone.dart:888) #45     _customzone.run (dart:async/zone.dart:793) #46     _customzone.runguarded (dart:async/zone.dart:701) #47     _customzone.bindcallback. (dart:async/zone.dart:726) #48     _rootrun (dart:async/zone.dart:892) #49     _customzone.run (dart:async/zone.dart:793) #50     _customzone.runguarded (dart:async/zone.dart:701) #51     _customzone.bindcallback. (dart:async/zone.dart:726) #52     _asyncruncallbackloop (dart:async/schedule_microtask.dart:41) #53     _asyncruncallback (dart:async/schedule_microtask.dart:48) #54     _runpendingimmediatecallback (dart:isolate-patch/isolate_patch.dart:84) #55     _rawreceiveportimpl._handlemessage (dart:isolate-patch/isolate_patch.dart:131) ).  package:gcloud/src/db/model_db_impl.dart 126:7  fromdatastoreentity dart:core                                       list.foreach package:gcloud/common.dart 58:23                _handlepage dart:isolate                                    _rawreceiveportimpl._handlemessage #48     _rootrun (dart:async/zone.dart:892) #49     _customzone.run (dart:async/zone.dart:793) #50     _customzone.runguarded (dart:async/zone.dart:701) #51     _customzone.bindcallback. (dart:async/zone.dart:726) #52     _asyncruncallbackloop (dart:async/schedule_microtask.dart:41) #53     _asyncruncallback (dart:async/schedule_microtask.dart:48) #54     _runpendingimmediatecallback (dart:isolate-patch/isolate_patch.dart:84) #55     _rawreceiveportimpl._handlemessage (dart:isolate-patch/isolate_patch.dart:131) ).  package:gcloud/src/db/model_db_impl.dart 126:7  fromdatastoreentity dart:core                                       list.foreach package:gcloud/common.dart 58:23                _handlepage dart:isolate                                    _rawreceiveportimpl._handlemessage #52     _asyncruncallbackloop (dart:async/schedule_microtask.dart:41) #53     _asyncruncallback (dart:async/schedule_microtask.dart:48) #54     _runpendingimmediatecallback (dart:isolate-patch/isolate_patch.dart:84) #55     _rawreceiveportimpl._handlemessage (dart:isolate-patch/isolate_patch.dart:131) ).  package:gcloud/src/db/model_db_impl.dart 126:7  fromdatastoreentity dart:core                                       list.foreach package:gcloud/common.dart 58:23                _handlepage dart:isolate                                    _rawreceiveportimpl._handlemessage 

what

gcloud preview app run app.yaml --clear-datastore 

as answered here https://groups.google.com/a/dartlang.org/forum/#!topic/cloud/iyo-wsc__8i ?