Calibre having issues communicating with SD Card

[Mishca]

I have been getting this error message all day when I connect my Kindle Fire (5th Generation).

calibre, version 3.18.0
ERROR: Error: Error communicating with device

Cannot write to file: 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 510, in _books
File "site-packages\calibre\devices\mtp\driver.py", line 218, in books
File "site-packages\calibre\devices\mtp\driver.py", line 190, in get_driveinfo
File "site-packages\calibre\devices\mtp\driver.py", line 180, in _update_drive_info
File "site-packages\calibre\devices\mtp\driver.py", line 151, in put_calibre_file
File "site-packages\calibre\devices\mtp\windows\driver.py", line 37, in check_thread
File "site-packages\calibre\devices\mtp\windows\driver.py", line 441, in put_file
WPDError: Cannot write to file: hr=2147500037 facility=0 error_code=16389 description: Unspecified error


I want to note that this error is ONLY occurring in response to my microSD card and Calibre is working just fine to read the items on the main storage. I have so far:

1. restarted both my computer and my kindle device
2. removed the microSD card and reinserted it
3. deleted the Calibre files (driveinfo.calibre and metadata.calibre)
4. updating my version of Calibre
5. trying a different USB Port and cord.

Again Calibre works perfectly fine if my microSD card is not in the device. I also can still move files manually using the file viewer on my desktop without an issue to the Kindle and microSD card. This error appears to strictly be on Calibre's end.

[kovidgoyal]

Basically that is the device saying it cannot write to files on the card. You can try reformatting the card using a FAT32 filesystem. Or you can add your books to the card separately by using a card reader and the connect to folder function in calibre.