Werkzeug error during install

Hi Daemos,
As I was unable to get th 0.8.8 running fine, I actually re-install from scrach and in the log I found that :
Traceback (most recent call last):
File “/usr/local/lib/python3.8/dist-packages/flask/app.py”, line 1950, in full_dispatch_request
rv = self.dispatch_request()
File “/usr/local/lib/python3.8/dist-packages/flask/app.py”, line 1926, in dispatch_request
File “/usr/local/lib/python3.8/dist-packages/flask/app.py”, line 1908, in raise_routing_exception
raise request.routing_exception
File “/usr/local/lib/python3.8/dist-packages/flask/ctx.py”, line 350, in match_request
result = self.url_adapter.match(return_rule=True)
File “/usr/local/lib/python3.8/dist-packages/werkzeug/routing.py”, line 1799, in match
raise NotFound()
werkzeug.exceptions.NotFound: 404 Not Found: The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.

Any idea about this issue ?

Best regards.