The first error is saying that, on line 11 of the file "chap01.xhtml" inside your EPUB file, there's an element which isn't properly closed. Given how early in the XHTML file that is, it's probably in the HEAD section of the file, and quite possibly one of the elements that consists of just a single tag, which should end in " />" - the most likely thing is that the closing "slash" character is missing. Alternatively, it could be an element that is missing the closing tag (e.g. for every <p> there should be a corresponding </p>).
The second error is indicating that, on line 14 of the file "titlepage.xhtml", there's an element with the attribute "PreserveAspectRatio", but the value given for that attribute is invalid. As far as I know this attribute is part of the SVG element, and the most likely value you'd want it set to is "xMidYMid meet" (see
http://www.w3.org/TR/SVG/coords.html...RatioAttribute).
If that info doesn't help you fix these errors, I suggest you give a bit more info about what format you're converting to EPUB, and what tool(s) you're using, and hopefully someone will be able to advise further.