
Traceback (most recent call last):

 "/usr/local/lib/python3.5/dist-packages/notebook/services/contents/filemanager.py", line 391, in save
self.check_and_sign(nb, path)

 "/usr/local/lib/python3.5/dist-packages/notebook/services/contents/manager.py", line 431, in check_and_sign
self.notary.sign(nb)

 "/usr/local/lib/python3.5/dist-packages/nbformat/sign.py", line 246, in sign
self.store_signature(signature, nb)

 "/usr/local/lib/python3.5/dist-packages/nbformat/sign.py", line 249, in store_signature
if self.db is None:

 "/usr/local/lib/python3.5/dist-packages/traitlets/traitlets.py", line 529, in __get__
return self.get(obj, cls)

 "/usr/local/lib/python3.5/dist-packages/traitlets/traitlets.py", line 508, in get
value = self._validate(obj, dynamic_default())

 "/usr/local/lib/python3.5/dist-packages/nbformat/sign.py", line 127, in _db_default
self.init_db(db)

 "/usr/local/lib/python3.5/dist-packages/nbformat/sign.py", line 139, in init_db
)""")
sqlite3.OperationalError: database is locked
Traceback (most recent call last):


 "cx_freeze_setup.py", line 9, in <module>

from cx_Freeze import ConfigError


 "c:\test_venv\lib\site-packages\cx_Freeze\__init__.py", line 13, in <module>

from cx_Freeze.freezer import ConstantsModule, Executable, Freezer


 "c:\test_venv\lib\site-packages\cx_Freeze\freezer.py", line 35, in <module>

import cx_Freeze.util
ModuleNotFoundError: No module named 'cx_Freeze.util'
