NOOK HD+ Failed to create folder

Windows 10, can't download a book with Calibre 2.55. Different Nook, different PC, same OS level, no problem. Any hints at what to change to fix this?

calibre, version 2.55.0
ERROR: Error: Error communicating with device

Failed to create folder: hr=2147500037 facility=0 error_code=16389 description: Unspecified error


Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 87, in run
File "site-packages\calibre\gui2\device.py", line 584, in _upload_books
File "site-packages\calibre\devices\mtp\driver.py", line 425, in upload_books
File "site-packages\calibre\devices\mtp\driver.py", line 401, in ensure_parent
File "site-packages\calibre\devices\mtp\windows\driver.py", line 35, in check_thread
File "site-packages\calibre\devices\mtp\windows\driver.py", line 404, in create_folder
WPDError: Failed to create folder: hr=2147500037 facility=0 error_code=16389 description: Unspecified error