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If it means anything, I've encountered this same error as well, during deletion of books.
Calibre is 1.6, 64-bit, running on Windows 7 x64.
I've already removed and re-installed Calibre to see if this resolves the issue. (Normally, I install on top of the previous version; don't know if that is officially supported or nto.) I did not remove the configuration folder and all plugins from my user profile; I'd hate do do all the configuration anew, if not absolutely necessary.
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