That is an actual error.  It basically is saying that your epub has a link to a resource that is not listed in the manifest itself.  Could the html page you added have had a link to an external resource?
It also indicates that fc needs include either the name of the opf file or better yet a name of the file that has the strange link to it.
I will look into fixing that.
Kevin
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					Originally Posted by  Moonraker
					 
				 
				Thank you KevinH, I guessed that was the case because I know FlightCrew has not been updated for a long time. I like to use it because it does find unused images and pages which I prefer to delete in order to keep the epub smaller in size. 
 
For your info I am attaching screenshot: 
			
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