The file has been perfectly usable for kindle as an epub. However, I am trying to ensure it is usable for smashwords (and smashwords suggests using the validator which found this error). Is this error something minor and/or insignificant that can be simply overlooked?
Or should I do as Sarmat89 suggested and open with an archive manager and look inside the content.opf file to find and make the correction?
If the latter, can someone suggest a freeware archive manger to do this with as I am unfamiliar with any of this.
thanks
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