problem: 'NoneType' object has no attribute 'config_file_paths'

[yangzhipeng1108]

jupyter labextension install jupyterlab_tensorboard An error occured. AttributeError: 'NoneType' object has no attribute 'config_file_paths' See the log file for details: /tmp/jupyterlab-debug-d9lefllj.log

File "/usr/local/lib/python3.8/dist-packages/traitlets/traitlets.py", line 1580, in trait_defaults return self._get_trait_default_generator(names[0])(self)

File "/usr/local/lib/python3.8/dist-packages/traitlets/traitlets.py", line 977, in call return self.func(*args, **kwargs)

File "/usr/local/lib/python3.8/dist-packages/jupyterlab/labextensions.py", line 120, in _default_labextensions_path lab.load_config_file()

File "/usr/local/lib/python3.8/dist-packages/jupyter_core/application.py", line 174, in load_config_file self.log.debug("Searching %s for config files", self.config_file_paths)

File "/usr/local/lib/python3.8/dist-packages/jupyter_server/extension/application.py", line 168, in config_file_paths return self.serverapp.config_file_paths

AttributeError: 'NoneType' object has no attribute 'config_file_paths'

Exiting application: lab