That error is actually pretty new. Whatever version of EpubCheck came with the previous version of Doitsu's plugin didn't flag the empty guide element as an error in epub2. It's a little odd that it
does flag it as an error given the wording of the spec:
Quote:
Within the package there may be one guide element, containing one or more reference elements.
Reading Systems are not required to use the guide element in any way.
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It's (the guide element) deprecated (and completely optional) in epub3.
EpubCheck doesn't bark at all if the guide element is left out entirely, but of course Sigil adds it back in during its parsing. I wonder what changed to make them start flagging empty guides in epub2? That basically renders Sigil's default blank epub2 as invalid right out of the gate.
