I have tried calibre on Windows machine and I moved one step forward

The device was found, but when I tried to download The Economist rss it crashed:
Job: **Upload 1 books to device:economist [Tr, 14 Sau 2009]**
**TypeError**: coercing to Unicode: need string or buffer, file found
**Traceback**:
Traceback (most recent call last):
File "calibre\gui2\device.pyo", line 20, in run
File "calibre\gui2\device.pyo", line 141, in _upload_books
File "calibre\devices\usbms\driver.pyo", line 58, in upload_books
File "genericpath.pyo", line 49, in getsize
TypeError: coercing to Unicode: need string or buffer, file found