Those error are fairly self explanatory, somewhere in your page code you have a closing anchor tag </a>
which does not have a matching, preceding opening tag <a>
.
Probably the easiest way to find this would be a search on "</a>" and examine the code in all the locations it finds.
The second issue is inside an anchor tag you have used the href attribute but you have not put the value in quotes; you have
<a href=http:www.example.com/page.html>
and it should be
<a href="http:www.example.com/page.html">
Again probably the easiest way to find that is search gor href and example all the places that it is found.