Python Jupyter:创建笔记本失败，加载笔记本时出错

我对Jupyter笔记本电脑有一些问题

首先，应用程序似乎“不受信任”，出现提示时单击“信任”将无法执行任何操作：

其次，尝试创建新的Jupyter笔记本时出现以下错误：

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，如果我尝试加载其他Jupyter笔记本，我会遇到问题。例如，尝试在Jupyter的“Python训练营”中打开03 Function Practice Exercises.ipynb

我得到以下信息：

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

以及：

---

这是最近才开始的，我不知道为什么。这两个错误（无法创建新笔记本和无法打开现有笔记本）似乎都是由某种权限问题引起的。我不认为上图列表中的一些笔记本文件可以毫无问题地打开。感谢您的帮助

你明白了吗？你明白了吗？

[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
    (datetime.utcnow(), algorithm, digest),
sqlite3.OperationalError: database is locked
[W 14:57:45.840 NotebookApp] Unhandled error