Having the same issue, receiving error code after a half hour or more of "1 job". Original data was transferred from the desktop to Pro12 main storage (14,000 epubs) Caibre proceeds to process the on-board library, then stops with error codes:
calibre, version 3.15.0
ERROR: Error: Error communicating with device
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 285, in books
File "site-packages\calibre\devices\mtp\driver.py", line 308, in write_metadata_cache
File "site-packages\calibre\ebooks\metadata\book\json_codec.p y", line 134, in encode_to_file
File "json\__init__.py", line 251, in dumps
File "json\encoder.py", line 209, in encode
MemoryError
Deleted driveinfo.calibre, but no metadata.calibre found on the device. Rebooted both devices, and it seemed that there was a longer processing time before error.
Also, Calibre 3.15 has been shutting down by itself when ticking an action button, as well as when closing the error box.
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