40104:incorrect signature

[elleryq]

I tried this sample, but get None.

from plurk_oauth import PlurkAPI

plurk = PlurkAPI.fromfile(<path_to_API.keys>)
print(plurk.callAPI('/APP/Profile/getOwnProfile'))

Then I try to debug, I found 'requests.post()' in PlurkOAuth.request() return status_code=400, json={u'error_text': u'40104:incorrect signature'}, reason=BAD REQUEST.

1. I am sure that my consumer key/secret and access token/token_secret are correct, I had tested them in PlurkAPI test console.
2. I use the latest code, so the patch in 40104:incorrect signature with parameter in API #8 is included.