Have you seen this error message from iTunes Producer?
I worked on my ePub file in Sigil and now my customer is having trouble uploading it with iTunes Producer. This is the error message that he got:
1 package(s) were not uploaded because they had problems:
/Users/jeffgoforth/Music/iTunes Producer/Playlists/1424316545.itmsp - Error Messages:
Apple's web service operation was not successful
Unable to authenticate the package: 1424316545.itmsp
ERROR ITMS-4000: "Line 88 column 92: bad character content for element at XPath /package/book/assets/asset[1]/data_file/file_name"
This went through the ePub validator with no problems. Any ideas?
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