Can't serve as dashboard

[DPeterK]

The EDR Explorer interface should be able to be served as a dashboard with the following script (explore.py) and command:

import edr_explorer

explorer = edr_explorer.EDRExplorer()
explorer.layout

panel serve --show explore.py

However we encounter an error:

ion.application - ERROR - Error running application handler <bokeh.application.handlers.script.ScriptHandler object at 0x7fc141ff9b50>: No module named 'ipywidgets_bokeh'
File 'ipywidget.py', line 25, in _get_ipywidget:
from ipywidgets_bokeh.widget import IPyWidget 
Traceback (most recent call last):
  File "/.../miniconda3/envs/3dt-py/lib/python3.8/site-packages/bokeh/application/handlers/code_runner.py", line 231, in run
    exec(self._code, module.__dict__)
  ...
  File "/.../miniconda3/envs/3dt-py/lib/python3.8/site-packages/panel/pane/ipywidget.py", line 25, in _get_ipywidget
    from ipywidgets_bokeh.widget import IPyWidget
ModuleNotFoundError: No module named 'ipywidgets_bokeh'