Problem connecting Hisense Hi Reader Pro to Calibre

Just received my Hi Reader Pro, but when i tried to connect to Calibre via USB, I got the following error message:

calibre, version 6.14.1
ERROR: Error: Error communicating with device

C:\r\src\src\calibre\devices\mtp\windows\content_e numeration.cpp:710:Cannot write to file:[hr=0x80004005 wCode=0] Unspecified error

Traceback (most recent call last):
File "calibre\gui2\device.py", line 104, in run
File "calibre\gui2\device.py", line 556, in _books
File "calibre\devices\mtp\driver.py", line 224, in books
File "calibre\devices\mtp\driver.py", line 197, in get_driveinfo
File "calibre\devices\mtp\driver.py", line 187, in _update_drive_info
File "calibre\devices\mtp\driver.py", line 157, in put_calibre_file
File "calibre\devices\mtp\windows\driver.py", line 35, in check_thread
File "calibre\devices\mtp\windows\driver.py", line 444, in put_file
wpd.WPDError: C:\r\src\src\calibre\devices\mtp\windows\content_e numeration.cpp:710:Cannot write to file:[hr=0x80004005 wCode=0] Unspecified error

I tried re-installing Calibre, re-booting my computer and hi reader, but nothing seems to work. Wondering if anyone else has had similar problems, or know how to fix this.

Thanks in advance.