Originally Posted by olganazo
I have some of my epub that cannot get processed by my kobo. I can identify which books seems corrupted (copying one by one). How can I "repair" them ? I have not created them from html.
You need to edit it somehow and find the error. Sigil is a good ePub editor and has some error reporting tools. These might show you what is wrong and how to fix it.
Another way is to do an epub to epub conversion in calibre. Depending on what the actual problem is, this might fix it.