The Jupyter notebook application does not start in release release 2023-02 of WinPython64-3.11.4.0. The Jupyter lab application runs fine though.

Creating or opening a notebook gives a 500: Internal server error.

[I 2023-09-25 15:09:10.845 ServerApp] Creating new notebook in
[E 2023-09-25 15:09:12.222 ServerApp] Uncaught exception GET /notebooks/Untitled.ipynb?kernel_name=python3 (127.0.0.1)
HTTPServerRequest(protocol='http', host='localhost:8888', method='GET', uri='/notebooks/Untitled.ipynb?kernel_name=python3', version='HTTP/1.1', remote_ip='127.0.0.1')
Traceback (most recent call last):
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\tornado\web.py", line 1786, in execute
result = await result
^^^^^^^^^^^^
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\tornado\gen.py", line 786, in run
yielded = self.gen.send(value)
^^^^^^^^^^^^^^^^^^^^
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\nbclassic\notebook\handlers.py", line 101, in get
self.write(self.render_template('notebook.html',
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\jupyter_server\base\handlers.py", line 633, in render_template
return template.render(**ns)
^^^^^^^^^^^^^^^^^^^^^
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\jinja2\environment.py", line 1301, in render
self.environment.handle_exception()
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\jinja2\environment.py", line 936, in handle_exception
raise rewrite_traceback_stack(source=source)
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\nbclassic\templates\notebook.html", line 1, in top-level template code
{% extends "page.html" %}
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\nbclassic\templates\page.html", line 190, in top-level template code
{% block header %}
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\nbclassic\templates\notebook.html", line 115, in block 'header'
{% for exporter in get_frontend_exporters() %}
^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\nbclassic\notebook\handlers.py", line 46, in get_frontend_exporters
for name in get_export_names():
^^^^^^^^^^^^^^^^^^
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\nbconvert\exporters\base.py", line 150, in get_export_names
e = get_exporter(exporter_name)(config=config)
^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\nbconvert\exporters\base.py", line 109, in get_exporter
exporter = [e for e in exporters if e.name == name or e.name == name.lower()][0].load()
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\importlib_metadata_init.py", line 207, in load
module = import_module(match.group('module'))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\importlib_init_.py", line 126, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "", line 1204, in _gcd_import
File "", line 1176, in _find_and_load
File "", line 1147, in _find_and_load_unlocked
File "", line 690, in _load_unlocked
File "", line 940, in exec_module
File "", line 241, in call_with_frames_removed
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\nbconvert_reportlab_init.py", line 6, in
from .exporter import ReportlabExporter
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\nbconvert_reportlab\exporter.py", line 20, in
from .rlmarkdown import md_to_flowables
File "C:\Programs\WPy64-31140\python-3.11.4.amd64\Lib\site-packages\nbconvert_reportlab\rlmarkdown.py", line 16, in
class InlineRenderer(mistune.Renderer):
^^^^^^^^^^^^^^^^
AttributeError: module 'mistune' has no attribute 'Renderer'
[E 2023-09-25 15:09:12.233 NotebookApp] {
"Host": "localhost:8888",
"Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,/;q=0.8",
"Referer": "http://localhost:8888/tree",
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/117.0"
}
[E 2023-09-25 15:09:12.233 NotebookApp] 500 GET /notebooks/Untitled.ipynb?kernel_name=python3 (513089e1de1c45e28cd165a5d02ed540@127.0.0.1) 1325.55ms referer=http://localhost:8888/tree

As I have the Jupyter lab as alternative, this pose no problem for me. Nevertheless it is still an error.