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The problem is that the traceback makes no sense.
The line "File "site-packages\calibre\gui2\device.py", line 383, in add_books_to_metadata" refers to real code in 0.7.47, where the device driver is called. However, the line "File "<string>", line 372, in add_books_to_metadata" refers to nothing, and the line number makes no sense for the kobo driver. First, the <string> indication means that what is running is *not* part of calibre,. Second, that line number is not inside add_books_to_metadata, and the file name of <string> indicates that something bizarre is happening.
Have you installed a different driver, perhaps as a plugin? Have you installed calibre source? Have you put a driver in calibre's installation folder? You have clearly done *something*.
In any event, it is clear that you are not running a standard calibre release. Why that might be is a mystery, and one that we cannot solve. Only you know what the history of your installation is.
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