Nevermind how i create the new "content.opf", this file was OK and the eBook is well validated. I need some little modifications.
The errors are since the new version (3.12).
I've several eBook already in the calibre library : without any change, if i try to convert these eBooks, i've obtained the same error.
But, for these eBooks, i erase the file ePub and launches a new conversion is OK.
Something is wrong with the new version of calibre : a bug, a bad install (done twice), what else...
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