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It seems quite easy, it even gives a location of the error. You are referencing to a resource that is not in the ePUB. It could be various things, but probably an image. It could be that the resource is in the ePUB, but not at that location. If you can post what the reference is, we can check.
From the look of it, you have either used the Calibre editor or converted something to an ePUB using Calibre.
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