It could be a problem with the book already being on the device. If it is, you will need to remove and resend it.
But, I suspect an error in the code of the book. The calibre viewer is forgiving of errors in epubs. The RMSDK renderer on the Kobo devices is not. Edit the book again and run the error check. My guess will be there are some incorrectly nested tags on the page that should be displayed when it is blank. Or some missing close tags.
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