Jupyter。创建笔记本失败，加载笔记本错误

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Creating Notebook Failed:
The error was: Unexpected error while saving file: Desktop/Complete-Python-3-Bootcamp-master/03-Methods and Functions/Untitled.ipynb database is locked
第三，如果我试图加载其他Jupyter笔记本，我就会遇到问题。  例如，试图在Jupyter中打开 "Python Bootcamp "中的03-Function Practice Exercises.ipynb
 I get the following:
Error loading notebook
An unknown error occurred while loading this notebook. This version can load notebook formats or earlier. See the server log for details.
jupyer_mac.command终端记录。
[W 14:40:06.678 NotebookApp] Notebook Desktop/Complete-Python-3-Bootcamp-master/03-Methods and Functions/04-Function Practice Exercises - Solutions.ipynb is not trusted
[E 14:57:45.839 NotebookApp] Uncaught exception GET /api/contents/Desktop/Complete-Python-3-Bootcamp-master/03-Methods%20and%20Functions/03-Function%20Practice%20Exercises.ipynb?type=notebook&_=1562536665698 (::1)
HTTPServerRequest(protocol='http', host='localhost:8890', method='GET', uri='/api/contents/Desktop/Complete-Python-3-Bootcamp-master/03-Methods%20and%20Functions/03-Function%20Practice%20Exercises.ipynb?type=notebook&_=1562536665698', version='HTTP/1.1', remote_ip='::1')
Traceback (most recent call last):
  File "/anaconda3/lib/python3.7/site-packages/tornado/web.py", line 1699, in _execute
    result = await result
  File "/anaconda3/lib/python3.7/site-packages/tornado/gen.py", line 209, in wrapper
    yielded = next(result)
  File "/anaconda3/lib/python3.7/site-packages/notebook/services/contents/handlers.py", line 112, in get
    path=path, type=type, format=format, content=content,
  File "/anaconda3/lib/python3.7/site-packages/notebook/services/contents/filemanager.py", line 433, in get
    model = self._notebook_model(path, content=content)
  File "/anaconda3/lib/python3.7/site-packages/notebook/services/contents/filemanager.py", line 392, in _notebook_model
    self.mark_trusted_cells(nb, path)
  File "/anaconda3/lib/python3.7/site-packages/notebook/services/contents/manager.py", line 503, in mark_trusted_cells
    trusted = self.notary.check_signature(nb)
  File "/anaconda3/lib/python3.7/site-packages/nbformat/sign.py", line 439, in check_signature
    return self.store.check_signature(signature, self.algorithm)
  File "/anaconda3/lib/python3.7/site-packages/nbformat/sign.py", line 239, in check_signature