Prefix:rendition issue

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My company started to work with a distributor to put our epubs on multiple stores but we are having some issues.

I did the epubs on InDesign CC 2014. After exporting them, I validated them with pagina EPUB-Checker (4.0.1) and they were fine. I have sent the files to the distributor, but they said that the epubs had the following error "Re-declaration of reserved prefix 'rendition'".

Searching for a solution, I followed this instructions from the Adobe forums ( and after that the distributor said the files were ok.

Recently, the distributor said that iTunes rejected the epubs because of the error "Undeclared prefix: rendition. This error occurs 3 times." even though the epubs were accepted on other stores like Amazon.

Any guidance is appreciated.

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