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That error means that the viewer failed to connect to a worker process. That could be because something on your system is blocking calibre from running worker processes,or communicating with them, or your install is corrupted.
Does this error happen only in the viewer, or also when you run a convert in the main calibre program?
Search your computer for calibre.exe, ebook-viewer.exe and calibre_parallel.exe and make sure you have only one of each.
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