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KB0104: How can I fix a checksum error when uploading to iTunes?

Sometimes you can get an error similar to the following when uploading your Epub file to iTunes:

ERROR ITMS-3000: "Line 534 column 29: element "data_file" incomplete; missing required element "checksum"

The error message is not very helpful, but here are some things to try that have helped people in the past:

If you have other solutions that have worked, please let us know.


Contents | Start | End | Previous: KB0103: How can I open several projects at the same time? | Next: KB0105: Why does my cover image not show on a Kobo device?