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Old 04-27-2016, 09:30 PM   #10
kovidgoyal
creator of calibre
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That error literally means that calibre could not contact its worker process. Which means something is either preventing the worker process from running or blocking the worker process from using a pipe for communications. In my experience, the cause is always an antivirus/security program.

This error has nothing to do with the individual ebook you are trying to open. It will happen for *all* books until you figure out what is interfering with the worker process.
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