Anki 2.1.28 Error Message when reviewing cards

When I try and review my current cards i get this Error message even after starting anki with all addons disabled

Have tried googling to no avail

Anki 2.1.28 (7d8818f8) Python 3.8.0 Qt 5.15.0 PyQt 5.15.0
Platform: Windows 10
Flags: frz=True ao=False sv=1
Add-ons, last update check: 2020-07-26 19:12:50

[2020-07-27 02:06:59,841] ERROR in app: Exception on / [GET]
Traceback (most recent call last):
File “lib\site-packages\flask\”, line 2447, in wsgi_app
File “lib\site-packages\flask\”, line 1952, in full_dispatch_request
File “lib\site-packages\flask_cors\”, line 161, in wrapped_function
File “lib\site-packages\flask\”, line 1821, in handle_user_exception
File “lib\site-packages\”, line 39, in reraise
File “lib\site-packages\flask\”, line 1950, in full_dispatch_request
File “lib\site-packages\flask\”, line 1936, in dispatch_request
TypeError: allroutes() got an unexpected keyword argument ‘path’

Thanks for reporting it. It looks like an awkward bug on flask.
I did a pull request trying to fix this: