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FYI, just wanted to add I have been seeing this error for a few weeks on several different calibre versions. Currently have 1.24 and Mac OS Mavericks. Didn't see it before upgrading OS to Mavericks in October. 5000 ebooks.
calibre, version 1.24.0
ERROR: Unhandled exception: <b>Exception</b>:Failed to open u'/Users/stackm/Calibre Library/x (7512)/cover.jpg' with error: [Errno 24] Too many open files: u'/Users/stackm/Calibre Library/x (7512)/cover.jpg'
Traceback (most recent call last):
File "site-packages/calibre/gui2/cover_flow.py", line 109, in image
File "site-packages/calibre/gui2/library/models.py", line 668, in cover
File "site-packages/calibre/db/legacy.py", line 332, in cover
File "site-packages/calibre/db/cache.py", line 607, in cover
File "site-packages/calibre/db/cache.py", line 57, in call_func_with_lock
File "site-packages/calibre/db/cache.py", line 648, in copy_cover_to
File "site-packages/calibre/db/backend.py", line 1242, in copy_cover_to
Exception: Failed to open u'/Users/stackm/Calibre Library/x(7512)/cover.jpg' with error: [Errno 24] Too many open files: u'/Users/stackm/Calibre Library/x (7512)/cover.jpg'
It doesn't happen immediately, but I will see it after leaving it open for a few hours or overnight.
I did increase file descriptors on the OS. Do not have Google images plugin.
Calibre will refuse to exit, and keep popping up a box with the error. When I click OK it gives the error for a different item. So there is no way to restart it without killing the Calibre process using Activity Monitor.
Will experiment with Tasks Explorer.
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