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That error message is from a so called Java ResourceBundle, which is a mechanism to make the application translatable. Obviously there's a problem with replacing the format string %1$f, namely: f != java.lang.String means that f is supposed to be a String, but isn't. If the problem is still present in the code, I could try to fix it. Would be helpful if you send me your ePub file, otherwise I would just have to try to create my own with duplicated entries, which might lead to the same error condition or maybe doesn't.
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