I think something is cleaning up your temporary directory.
The viewer works by unpacking the book to temporary storage and then loading each file it is made up of as you read. I'd say what is happening is that you open one file, and while reading that, the rest of the files are cleaned up. When you turn the page to the next file, it isn't there and the error occurs.
I have no idea how to fix this on a Mac. I don't know if there is a process you need to stop, an exception to add or if you need to move calibre's temporary storage to a different location.
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