Can't send to Nook ST SD card

[Rand1956]

Calibre 0.8.68, Win7 64 HP, Nook Simple Touch with 4GB Micro SD card (3.2GB free). Calibre can send books to main memory (I've done so once since this started) but not to the card; hadn't tried to do so in a couple of weeks and just noticed this today. Win7 sees the Nook and the card, and three different SD card readers see it fine and will let me open epub files with Sigil. I can read books on the card with the Nook and delete books from the card with Calibre. Here's the debug file:

Spoiler:

calibre Debug log
calibre 0.8.68
Windows-7-6.1.7601-SP1
Windows
('Windows', '7', '6.1.7601')
Python 2.7.3
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Starting up...
Job: 1 Get device information started
DeviceJob: 1 Get device information done, calling callback
DeviceJob:Job: 11 Get device informationGet device information finishedcallback returned

No details available.
Job: 2 Get list of books on device started
DEBUG: 0.0 USBMS: Fetching list of books from device. Device= NOOK_COLOR oncard= None
DEBUG: 0.0 USBMS: dirs are: K:\ My Files
DEBUG: 0.0 USBMS: scan from root False K:\My Files
DEBUG: 0.0 USBMS: count found in cache: 6, count of files in metadata: 6, need_sync: False
DEBUG: 0.0 USBMS: Finished fetching list of books from device. oncard= None
DEBUG: 0.0 USBMS: Fetching list of books from device. Device= NOOK_COLOR oncard= carda
DEBUG: 0.0 USBMS: dirs are: H:\
DEBUG: 0.2 USBMS: scan from root False H:\
DEBUG: 0.4 USBMS: count found in cache: 80, count of files in metadata: 80, need_sync: False
DEBUG: 0.4 USBMS: Finished fetching list of books from device. oncard= carda
DEBUG: 0.4 USBMS: Fetching list of books from device. Device= NOOK_COLOR oncard= cardb
DeviceJob: 2 Get list of books on device done, calling callback
DeviceJob: 2 Get list of books on device callback returned
Job: 1 Get device information finished
No details available.
Job: 2 Get list of books on device finished
No details available.
Started up in 28.34 seconds with 3447 books
Job: 3 Delete books from device started
DEBUG: 24.3 USBMS: deleting 1 books
DEBUG: 24.3 USBMS: finished deleting 1 books
DeviceJob: 3 Delete books from device done, calling callback
DEBUG: 24.5 USBMS: removing metadata for 1 books
DEBUG: 24.5 USBMS: finished removing metadata for 1 books
DeviceJob: 3 Delete books from device callback returned
Job: 4 Send metadata to device started
DEBUG: 24.8 USBMS: starting sync_booklists
Job: 3 Delete books from device finished
No details available.
DEBUG: 25.0 USBMS: finished sync_booklists
DeviceJob: 4 Send metadata to device done, calling callback
DeviceJob: 4 Send metadata to device Job:callback returned
4 Send metadata to device finished
No details available.
Job: 4 Send metadata to device finished
No details available.
Job: 5 Upload 1 books to device:Legion started
Device using plugboard epub NOOK_COLOR None
Setting metadata in: Legion at: C:\Users\Rand\AppData\Local\Temp\calibre_0.8.68_tm p_qsemed\cjivxrcaltmpfmt.epub
DEBUG: 35.7 USBMS: uploading 1 books
DeviceJob: 5 Upload 1 books to device:Legion done, calling callback
'NOOK_COLOR' object has no attribute '_carda_prefix'

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 83, in run
File "site-packages\calibre\gui2\device.py", line 517, in _upload_books
File "site-packages\calibre\devices\usbms\driver.py", line 256, in upload_books
File "site-packages\calibre\devices\usbms\device.py", line 996, in _sanity_check
AttributeError: 'NOOK_COLOR' object has no attribute '_carda_prefix'

DeviceJob: 5 Upload 1 books to device:Legion callback returned
Job: 5 Upload 1 books to device:Legion finished
'NOOK_COLOR' object has no attribute '_carda_prefix'

Traceback (most recent call last):
File "site-packages\calibre\gui2\device.py", line 83, in run
File "site-packages\calibre\gui2\device.py", line 517, in _upload_books
File "site-packages\calibre\devices\usbms\driver.py", line 256, in upload_books
File "site-packages\calibre\devices\usbms\device.py", line 996, in _sanity_check
AttributeError: 'NOOK_COLOR' object has no attribute '_carda_prefix'

[DoctorOhh]

Originally Posted by Rand1956

AttributeError: 'NOOK_COLOR' object has no attribute '_carda_prefix'

This should be corrected in the next release.