I was not clear enough because I thought Save to disk and Save to device work the same way.
I start at the beginning: I tried out the metadata plugboard in Calibre, and I realized, that the metadata was not written into the kepub file, however, there was no error message shown. I was sick and tired to connect my reader many times, so I decided to continue my tests with the Save to disk instead. That time I got the error message, so I assumed, that this error message was the reason of the missing metadata in kepubs on my Kobo, so I asked for your help here. Then you created the 2.5.4 and I tried that with "Save to disk" again, and i got the second error message.
I realized I forgot to try out the "Send to device". I have just done now, and I have a good news, it is working, the desired title (using metadata plugboard) appeared correctly in my kepubs. So it seems now only the Save to disk is faulty.
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