Some of those errors I had corrected on my site PVC stolarija when I used “facebook-twitter-google-social-widgets”
…one" href="http://greenhillsoaps.com/"></g:plusone></div><li class="share… Element name g:plusone cannot be represented as XML 1.0. and Element g:plusone not allowed as child of element div in this context.
Just use <div class="g-plusone" data-size="medium" data-annotation="inline;%s" ></div> instead like this in your code <div style="display:inline;%s"><g:plusone size="medium" href="%s"></g:plusone>
For more go to http://www.google.com/webmasters/+1/button/ and click on Advanced options-> HTML5 valid syntax
