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Old 07-18-2026, 07:26 PM   #1
kazukasi
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Download Metadata Error
I have started getting an error when trying to download metadata. The metadata download was previously working, and I haven't changed anything.

Here is the full error message. I am using a mac OS 10.13.6

calibre, version 3.48.0
ERROR: Download failed: Failed to download metadata. Click "Show Details" to see details.

Traceback (most recent call last):
File "site-packages/calibre/utils/ipc/simple_worker.py", line 290, in main
File "site-packages/calibre/ebooks/metadata/sources/worker.py", line 103, in single_identify
File "site-packages/calibre/ebooks/metadata/sources/update.py", line 85, in patch_plugins
File "site-packages/calibre/ebooks/metadata/sources/update.py", line 41, in load_plugin
File "<string>", line 13, in <module>
ImportError: cannot import name _
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Old 07-18-2026, 08:39 PM   #2
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See this thread https://www.mobileread.com/forums/sh...d.php?t=374335
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Old 07-19-2026, 05:39 AM   #3
JSWolf
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It's becoming more and more difficult to download metadata. Sites are using protection to block the plugin from accessing the site. And Even if you can access the site, if you do it too many times in too short a period, you could be either temporarily blocked or your IP could be blocked.

Downloading metadata could be a thing of the past and you'd have to do it manually instead of a plugin to do it.
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Old 08-01-2026, 10:38 PM   #4
richorlin
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Quote:
Originally Posted by PeterT View Post
That's only for Calibre running on Windows. No help for us Mac people.
Anyone have any suggestions?
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Old 08-02-2026, 03:09 AM   #5
Ghostcat
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Ignore step 1. Just Delete/Rename the metadata-sources-cache.json file.
This worked for me on Linux.
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Old 08-06-2026, 03:26 AM   #6
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In order to do step 1, I first had to go to the ...etc folder's properties and clear the read-only flag (had to click admin permission to do that), then I could edit (and save) adding the line to the "hosts" file, which seemed to be what was meant.

I also renamed the indicated .json file.

Result: download metadata works again, but only if I do one at a time.
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