[pjmpjm]

I've suddenly started having trouble getting my Calibre to talk to my Kindle Fire. Have tried all the usual tricks but to no avail. Can someone please decipher this error message for me? Many thanks in advance.

calibre, version 5.22.0
ERROR: Error: Error communicating with device

C:\r\src\src\calibre\devices\mtp\windows\content_e numeration.cpp:336:Failed to EnumObjects() of folder from device:[hr=0x8007001e wCode=0] The system cannot read from the specified device.: o41

Traceback (most recent call last):
File "calibre\gui2\device.py", line 89, in run
File "calibre\gui2\device.py", line 515, in _books
File "calibre\devices\mtp\driver.py", line 220, in books
File "calibre\devices\mtp\driver.py", line 192, in get_driveinfo
File "calibre\devices\mtp\windows\driver.py", line 272, in filesystem_cache
wpd.WPDError: C:\r\src\src\calibre\devices\mtp\windows\content_e numeration.cpp:336:Failed to EnumObjects() of folder from device:[hr=0x8007001e wCode=0] The system cannot read from the specified device.: o41