PRS-T1 PRS-T1/Calibre: Usb connection fail

[andreacos]

hello all
this morning the program Calibre when i try to send one e/book to my reader has started to give me this message

calibre, version 0.8.63
ERRORE: Errore: Errore di comunicazione col dispositivo

[Error 18] File esauriti: u'I:\\Sony_Reader\\media\\books\\Schember, John\\*.*'

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 82, in run
File "site-packages\calibre\gui2\device.py", line 455, in _upload_books
File "site-packages\calibre\devices\usbms\driver.py", line 267, in upload_books
File "site-packages\calibre\devices\usbms\cli.py", line 50, in put_file
File "site-packages\calibre\utils\filenames.py", line 190, in case_preserving_open_file
WindowsError: [Error 18] File esauriti: u'I:\\Sony_Reader\\media\\books\\Schember, John\\*.*'

The version is old respect the newest but i tried to install the last to with the same result

I try to reset the reader to factory value but nothing has changed

I try to uninstal&install varius verions...the result is the same...

Can anyone help me, please...

Thanks, Andrew