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The opf files are only a backup of the data in the metadata.db file so are not strictly speaking necessary. They are created so that if the metdata.db file gets corrupted it can be rebuilt from the .opf files.
I suspect that your error message is a by-product of something else you are doing. You probably need to provide more information on how you are getting the books out of caslibe on the first machine, and adding them on the second one.
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