Hi,
I’ve created a panel dashboard that works well, but occasionally raises a TypeError that doesn’t seem to affect the dashboard functioning but does stack up long error messages. I’m able to work around the issues by setting pn.config.console_output = 'disable'. The error doesn’t seem to affect the output, so that is a fix, but I’d like to understand why the error is occurring and more importantly how to debug it.
The code to produce the dashboard is available here. This plot function creates a dashboard with three tabs to plot timeseries curves. The error (at the end of the post) occurs most often when selecting or un-selecting columns or groups of column identifiers on the third tab, which is used to create custom overlays of curves:
It seems like possibly a performance related issue. I haven’t been able to recreate the error by using the underlying plotting functions that the dashboard calls. I also haven’t found any reliable series of interactions with the dashboard to re-create the error.
I think the easiest (admittedly not that easy) way to try to attempt to re-create the issue is to clone the branch linked to above and add ct.plotting.plot(das) to the /docs/examples/concise_capacity_test.ipynb in place of the existing plotting call das.plot(marker='line', width=900, height=250, ncols=1, use_abrev_name=False).
Any suggestions on how to debug this or making it easier to re-create the issue would be much appreciated.
Thanks!
Here is the error message:
Traceback (most recent call last):
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/viewable.py", line 591, in _preprocess
hook(self, root, changed, old_models)
TypeError: link_axes() takes 2 positional arguments but 4 were given
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/pyviz_comms/__init__.py", line 340, in _handle_msg
self._on_msg(msg)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/viewable.py", line 471, in _on_msg
doc.unhold()
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/bokeh/document/document.py", line 776, in unhold
self.callbacks.unhold()
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/bokeh/document/callbacks.py", line 431, in unhold
self.trigger_on_change(event)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/bokeh/document/callbacks.py", line 408, in trigger_on_change
invoke_with_curdoc(doc, event.callback_invoker)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/bokeh/document/callbacks.py", line 443, in invoke_with_curdoc
return f()
^^^
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/bokeh/util/callback_manager.py", line 185, in invoke
callback(attr, old, new)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/reactive.py", line 469, in _comm_change
state._handle_exception(e)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/io/state.py", line 436, in _handle_exception
raise exception
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/reactive.py", line 467, in _comm_change
self._schedule_change(doc, comm)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/reactive.py", line 449, in _schedule_change
self._change_event(doc)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/reactive.py", line 445, in _change_event
self._process_events(events)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/reactive.py", line 384, in _process_events
self.param.update(**self_events)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/param/parameterized.py", line 1902, in update
self_._batch_call_watchers()
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/param/parameterized.py", line 2063, in _batch_call_watchers
self_._execute_watcher(watcher, events)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/param/parameterized.py", line 2025, in _execute_watcher
watcher.fn(*args, **kwargs)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/param.py", line 869, in _replace_pane
self._update_inner(new_object)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/pane/base.py", line 704, in _update_inner
new_pane, internal = self._update_from_object(
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/pane/base.py", line 682, in _update_from_object
old_object.object = object
^^^^^^^^^^^^^^^^^
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/param/parameterized.py", line 369, in _f
return f(self, obj, val)
^^^^^^^^^^^^^^^^^
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/param/parameterized.py", line 1252, in __set__
obj.param._call_watcher(watcher, event)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/param/parameterized.py", line 2043, in _call_watcher
self_._execute_watcher(watcher, (event,))
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/param/parameterized.py", line 2025, in _execute_watcher
watcher.fn(*args, **kwargs)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/pane/base.py", line 324, in _update_pane
self._update_object(ref, doc, root, parent, comm)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/pane/base.py", line 315, in _update_object
state._views[ref][0]._preprocess(root)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/viewable.py", line 593, in _preprocess
hook(self, root)
File "/home/ben/miniconda3/envs/pvcaptest/lib/python3.11/site-packages/panel/pane/holoviews.py", line 862, in link_axes
if axis.start > axis.end:
^^^^^^^^^^^^^^^^^^^^^
TypeError: The DType <class 'numpy.dtype[datetime64]'> could not be promoted by <class 'numpy.dtype[float64]'>. This means that no common DType exists for the given inputs. For example they cannot be stored in a single array unless the dtype is `object`. The full list of DTypes is: (<class 'numpy.dtype[datetime64]'>, <class 'numpy.dtype[float64]'>)