[Leonatus]

Calibre v. 5.0.1, Windows 10 32 bit.
At running "Modify ebub", I recently receive this message:

Modify ePubs
Traceback (most recent call last):
  File "runpy.py", line 194, in _run_module_as_main
  File "runpy.py", line 87, in _run_code
  File "site.py", line 89, in <module>
  File "site.py", line 84, in main
  File "site.py", line 55, in run_entry_point
  File "site-packages\calibre\utils\ipc\worker.py", line 215, in main
  File "site-packages\calibre\utils\ipc\worker.py", line 143, in arbitrary_n
  File "importlib\__init__.py", line 127, in import_module
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 655, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 618, in _load_backward_compatible
  File "site-packages\calibre\customize\zipplugin.py", line 184, in load_module
  File "calibre_plugins.modify_epub.jobs", line 14, in <module>
  File "site-packages\calibre\customize\zipplugin.py", line 184, in load_module
  File "calibre_plugins.modify_epub.modify", line 22, in <module>
  File "site-packages\calibre\customize\zipplugin.py", line 184, in load_module
  File "calibre_plugins.modify_epub.container", line 14, in <module>
ModuleNotFoundError: No module named 'urlparse'

This occurs with every book I try to handle. Any idea?