run examples\LinkedCharts.ipynb got Keyerror with sourcedata tab not work

[markqiu]

Got the following error:

Callback failed for object named "Tabs00131" changing property {'active': 1} 
Traceback (most recent call last):
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\reactive.py", line 315, in _process_events
    self.param.update(**self_events)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 1898, in update
    self_._batch_call_watchers()
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 2059, in _batch_call_watchers
    self_._execute_watcher(watcher, events)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 2021, in _execute_watcher
    watcher.fn(*args, **kwargs)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\layout\tabs.py", line 128, in _update_active
    self.param.trigger('objects')
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 1989, in trigger
    self_.set_param(**dict(params, **triggers))
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 1925, in set_param
    return self_.update(kwargs)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 1898, in update
    self_._batch_call_watchers()
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 2059, in _batch_call_watchers
    self_._execute_watcher(watcher, events)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 2021, in _execute_watcher
    watcher.fn(*args, **kwargs)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\reactive.py", line 304, in _param_change
    self._apply_update(named_events, msg, model, ref)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\reactive.py", line 239, in _apply_update
    self._update_model(events, msg, root, model, doc, comm)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\layout\base.py", line 99, in _update_model
    state._views[ref][0]._preprocess(root)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\viewable.py", line 500, in _preprocess
    hook(self, root)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\links.py", line 247, in _process_callbacks
    cb(root_model, link, src, tgt, arg_overrides=overrides)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\links.py", line 342, in __init__
    self._init_callback(root_model, link, source, src_spec, target, tgt_spec, code)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\links.py", line 429, in _init_callback
    arg_model = self._resolve_model(root_model, v, None)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\links.py", line 387, in _resolve_model
    model, _ = obj._models[root_model.ref['id']]
KeyError: '1008'
2022-08-26 12:28:19,653 Exception in callback functools.partial(<bound method IOLoop._discard_future_result of <tornado.platform.asyncio.AsyncIOMainLoop object at 0x00000287A32D0D30>>, <Task finished name='Task-77' coro=<ServerSession.with_document_locked() done, defined at C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\bokeh\server\session.py:78> exception=KeyError('1008')>)
Traceback (most recent call last):
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\tornado\ioloop.py", line 741, in _run_callback
    ret = callback()
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\tornado\ioloop.py", line 765, in _discard_future_result
    future.result()
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\bokeh\server\session.py", line 99, in _needs_document_lock_wrapper
    result = await result
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\reactive.py", line 356, in _change_coroutine
    self._change_event(doc)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\reactive.py", line 370, in _change_event
    self._process_events(events)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\reactive.py", line 315, in _process_events
    self.param.update(**self_events)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 1898, in update
    self_._batch_call_watchers()
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 2059, in _batch_call_watchers
    self_._execute_watcher(watcher, events)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 2021, in _execute_watcher
    watcher.fn(*args, **kwargs)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\layout\tabs.py", line 128, in _update_active
    self.param.trigger('objects')
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 1989, in trigger
    self_.set_param(**dict(params, **triggers))
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 1925, in set_param
    return self_.update(kwargs)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 1898, in update
    self_._batch_call_watchers()
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 2059, in _batch_call_watchers
    self_._execute_watcher(watcher, events)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\param\parameterized.py", line 2021, in _execute_watcher
    watcher.fn(*args, **kwargs)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\reactive.py", line 304, in _param_change
    self._apply_update(named_events, msg, model, ref)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\reactive.py", line 239, in _apply_update
    self._update_model(events, msg, root, model, doc, comm)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\layout\base.py", line 99, in _update_model
    state._views[ref][0]._preprocess(root)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\viewable.py", line 500, in _preprocess
    hook(self, root)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\links.py", line 247, in _process_callbacks
    cb(root_model, link, src, tgt, arg_overrides=overrides)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\links.py", line 342, in __init__
    self._init_callback(root_model, link, source, src_spec, target, tgt_spec, code)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\links.py", line 429, in _init_callback
    arg_model = self._resolve_model(root_model, v, None)
  File "C:\Users\qiuch\anaconda3\envs\panel-highcharts\lib\site-packages\panel\links.py", line 387, in _resolve_model
    model, _ = obj._models[root_model.ref['id']]
KeyError: '1008'

I think it's maybe caused by the download_button.
Thanks!