---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-4-9ef080a15349> in <module>
      3 recording, sorting = se.example_datasets.toy_example(num_channels=12, K=12)
      4 ev.TimeseriesView(
----> 5     recording=recording
      6 ).show()

/opt/conda/lib/python3.7/site-packages/ephys_viz/BaseWidget.py in show(self, **kwargs)
    189                 for child_id in self._child_ids
    190             ],
--> 191             props=self._props
    192         )
    193         if init_info['mode'] == 'colab':

/opt/conda/lib/python3.7/site-packages/reactopya_jup/reactopyajupyterwidget.py in __init__(self, project_name, type, initial_children, props, key)
     43         self.set_trait('_project_name', project_name)
     44         self.set_trait('_type', type)
---> 45         self.set_trait('_props', _json_serialize(props))
     46         self.set_trait('_initial_children', _json_serialize(initial_children))
     47         self.set_trait('_key', key)

/opt/conda/lib/python3.7/site-packages/traitlets/traitlets.py in set_trait(self, name, value)
   1341                                 (cls.__name__, name))
   1342         else:
-> 1343             getattr(cls, name).set(self, value)
   1344 
   1345     @classmethod

/opt/conda/lib/python3.7/site-packages/traitlets/traitlets.py in set(self, obj, value)
    572             # we explicitly compare silent to True just in case the equality
    573             # comparison above returns something other than True/False
--> 574             obj._notify_trait(self.name, old_value, new_value)
    575 
    576     def __set__(self, obj, value):

/opt/conda/lib/python3.7/site-packages/traitlets/traitlets.py in _notify_trait(self, name, old_value, new_value)
   1137             new=new_value,
   1138             owner=self,
-> 1139             type='change',
   1140         ))
   1141 

/opt/conda/lib/python3.7/site-packages/ipywidgets/widgets/widget.py in notify_change(self, change)
    603             if name in self.keys and self._should_send_property(name, getattr(self, name)):
    604                 # Send new state to front-end
--> 605                 self.send_state(key=name)
    606         super(Widget, self).notify_change(change)
    607 

/opt/conda/lib/python3.7/site-packages/ipywidgets/widgets/widget.py in send_state(self, key)
    487             state, buffer_paths, buffers = _remove_buffers(state)
    488             msg = {'method': 'update', 'state': state, 'buffer_paths': buffer_paths}
--> 489             self._send(msg, buffers=buffers)
    490 
    491 

/opt/conda/lib/python3.7/site-packages/ipywidgets/widgets/widget.py in _send(self, msg, buffers)
    735         """Sends a message to the model in the front-end."""
    736         if self.comm is not None and self.comm.kernel is not None:
--> 737             self.comm.send(data=msg, buffers=buffers)
    738 
    739     def _repr_keys(self):

/opt/conda/lib/python3.7/site-packages/ipykernel/comm/comm.py in send(self, data, metadata, buffers)
    121         """Send a message to the frontend-side version of this comm"""
    122         self._publish_msg('comm_msg',
--> 123             data=data, metadata=metadata, buffers=buffers,
    124         )
    125 

/opt/conda/lib/python3.7/site-packages/ipykernel/comm/comm.py in _publish_msg(self, msg_type, data, metadata, buffers, **keys)
     63         data = {} if data is None else data
     64         metadata = {} if metadata is None else metadata
---> 65         content = json_clean(dict(data=data, comm_id=self.comm_id, **keys))
     66         self.kernel.session.send(self.kernel.iopub_socket, msg_type,
     67             content,

/opt/conda/lib/python3.7/site-packages/ipykernel/jsonutil.py in json_clean(obj)
    189         out = {}
    190         for k,v in iteritems(obj):
--> 191             out[unicode_type(k)] = json_clean(v)
    192         return out
    193     if isinstance(obj, datetime):

/opt/conda/lib/python3.7/site-packages/ipykernel/jsonutil.py in json_clean(obj)
    189         out = {}
    190         for k,v in iteritems(obj):
--> 191             out[unicode_type(k)] = json_clean(v)
    192         return out
    193     if isinstance(obj, datetime):

/opt/conda/lib/python3.7/site-packages/ipykernel/jsonutil.py in json_clean(obj)
    189         out = {}
    190         for k,v in iteritems(obj):
--> 191             out[unicode_type(k)] = json_clean(v)
    192         return out
    193     if isinstance(obj, datetime):

/opt/conda/lib/python3.7/site-packages/ipykernel/jsonutil.py in json_clean(obj)
    189         out = {}
    190         for k,v in iteritems(obj):
--> 191             out[unicode_type(k)] = json_clean(v)
    192         return out
    193     if isinstance(obj, datetime):

/opt/conda/lib/python3.7/site-packages/ipykernel/jsonutil.py in json_clean(obj)
    195 
    196     # we don't understand it, it's probably an unserializable object
--> 197     raise ValueError("Can't clean for JSON: %r" % obj)

ValueError: Can't clean for JSON: <spikeextractors.extractors.numpyextractors.numpyextractors.NumpyRecordingExtractor object at 0x7f8d0fcf4240>