Your template could not be parsed as it is not well-formed. Please make sure all XML elements are closed properly.Why so !
Because blogger/blogspot uses strict XHTML entities in its template.
Adsense Code Converter For Blogger / Blogspot Blogs :
Is there any Adsense Program Policy violation by using HTML Encoder Tool !
Not at all. Actually by converting your code, you are not modifying the adsense ad code in any way. Using this tool doesn’t breaks AdSense program policies. Once you apply the converted code, have a look at your HTML source, find your adsense code, match it with original code, you will find no change at all.