That is an error writing the metadata.calibre file onto the ereader. My first thought when I see this is that there is a problem on the disk of the reader. This could be the file system has become damaged. A checkdisk on the drive would fix this.
Of course, that doesn't quite make sense with an "Invalid argument" error.
Could you have a look and see if the metadata.calibre is on the ereader's drive? And is readable.
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