I recently upgraded from version 8.0.4 to 8.1.1 and was creating a new 
environment on a new computer.  When attempting to install the plugins that 
I use, I keep running into the following error from Nikola.

Traceback (most recent call last):
  File "c:\program files (x86)\python38-32\lib\runpy.py", line 194, in 
_run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\program files (x86)\python38-32\lib\runpy.py", line 87, in 
_run_code
    exec(code, run_globals)
  File "C:\Users\ejunk\nikola-env\Scripts\nikola.exe\__main__.py", line 7, 
in <module>
  File "c:\users\ejunk\nikola-env\lib\site-packages\nikola\__main__.py", 
line 167, in main
    _ = DN.run(oargs)
  File "c:\users\ejunk\nikola-env\lib\site-packages\nikola\__main__.py", 
line 341, in run
    self.nikola.init_plugins(load_all=True)
  File "c:\users\ejunk\nikola-env\lib\site-packages\nikola\nikola.py", line 
1073, in init_plugins
    self.plugin_manager._candidates = self._filter_duplicate_plugins(self.
plugin_manager._candidates)
  File "c:\users\ejunk\nikola-env\lib\site-packages\nikola\nikola.py", line 
996, in _filter_duplicate_plugins
    plugins.sort(key=plugin_position_in_places)
TypeError: '<' not supported between instances of 'int' and 'NoneType'

The error does not seem to be limited to a single plugin.  Sometimes I can 
install one or two plugins before I get the error and sometimes it happens 
with the first plugin I install.  Once the error happens, the only way to 
get Nikola to do anything is to delete all the plugins.  This is being done 
in a fresh virtualenv and a fresh nikola site (nikola init mysite).  I am 
attempting to install the plugins sass, sidebar, file_tree_subs, tags, 
static_tag_cloud, and localsearch.

OS is Windows 10 home, version 1909
Python 3.8.3 x32
Nikola 8.1.1

Any help you can give would be greatly appreciated!

Erik

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