Jupyter安装nbextensions,启动提示没有nbextensions库

ModuleNotFoundError: No module named 'jupyter_nbextensions_configurator'

 Traceback (most recent call last):
  File "/usr/local/Cellar/jupyterlab/2.0.1/libexec/lib/python3.7/site-packages/notebook/notebookapp.py", line 1670, in init_server_extensions
  mod = importlib.import_module(modulename)
  File "/usr/local/Cellar/jupyterlab/2.0.1/libexec/lib/python3.7/importlib/__init__.py", line 127, in import_module
  return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 965, in _find_and_load_unlocked
 ModuleNotFoundError: No module named 'jupyter_nbextensions_configurator'