I've had that same error a couple of times yesterday, when opening the Editor from the Viewer toolbar button.
Now I tried to reproduce, and it wasn't easy, but eventually I remembered what I was trying to do: I wanted to see in the Editor the formatting for the text containing the name of the translator, in order to write an extracting rule for the EPOM plugin.
So I selected this text, and after clicking the "Edit this book" Viewer toolbar button, got the same message again. It's awesome that the Editor opens to the current chapter!
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