HTML validator

I have had lots of issues with the theme I am using ‘urban black’ down likely to me going into theme editor and stabbing around in the dark.

I am learning how to do everything to the book and reading all the wp documents.

I used the HTML validator to check my home page before I made any changes and it already came up with two errors is that normal?

http://validator.w3.org/check?uri=http%3A%2F%2Fwww.troopbox.co.uk%2F&charset=%28detect+automatically%29&doctype=Inline&group=0

Thanks