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The first says you can not use a "font" tag in xhtml. Use css instead.
The second says you have a url that ends in a fragment identifier that is not set anyplace in the file by ad id attribute.
In other words look for a url that ends with #NAME where no tag in the target file has the id="NAME". NAME can be almost any short string.
You really should at least try to read up on html and css and use google to search for your answers and not just ask here, as your questions have nothing to do with Sigil specifically. Perhaps the more generic EPUB forum here at mobileread might be a better place after trying to search to find the answer yourself.
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