While running setup wizard I encountered above error, and setup failed.
Seems related to threading, and the file calling the thread managements:
I edited the file /…/…/frappe-bench/env/lib/python2.7/site-packages/werkzeug/serving.py
**class ThreadedWSGIServer(ThreadingMixIn, BaseWSGIServer):**
** “”“A WSGI server that does threading.”""**
** multithread = True**
** daemon_threads = False**
and my setup was able to complete, is there a reason to setting daemon_threads = True