Error message-Cant communicate with device

[pookiebr]

Running Calibre v 7.14 with windows 10 64bit. Have a Kindle fire 7 tablet that Im trying to transfer books to via USB cable. The USB peferences are set to file transfer. Was able to transfer 1 group of books then started getting the error message cant communicate with device. Any help would be greatly appreciated......



's10001'

Traceback (most recent call last):
File "calibre\gui2\device.py", line 112, in run
File "calibre\gui2\device.py", line 596, in _sync_booklists
File "calibre\devices\mtp\driver.py", line 370, in sync_booklists
File "calibre\devices\mtp\driver.py", line 360, in write_metadata_cache
File "calibre\devices\mtp\driver.py", line 200, in put_calibre_file
File "calibre\devices\mtp\windows\driver.py", line 37, in check_thread
File "calibre\devices\mtp\windows\driver.py", line 447, in put_file
File "calibre\devices\mtp\windows\driver.py", line 37, in check_thread
File "calibre\devices\mtp\windows\driver.py", line 431, in delete_file_or_folder
File "calibre\devices\mtp\filesystem_cache.py", line 120, in parent
KeyError: 's10001'