Can't upload attachment on MoinMoin - upload

I have installed MoinMoin on my Windows machine:
MoinMoin 1.9.7,
Python 2.7
However, I can't upload an attachment to any page. I got the following error whenever I click "Upload":
Bad Request
The browser (or proxy) sent a request that this server could not understand.
I've tried Python 2.5 too and the behavior is the same.

well, you don't give enough details so one could really help you.
so I can just say that this is unusual. it is unlikely a problem in moinmoin or in python.
maybe some problem with your installation or web server configuration.
maybe have a look into the web server logs.

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