Hi Oak.

These errors you are getting tend to come from a thing nicknamed the domino effect.
You have forgotten to close a tag somewhere along the way (usually a </div>) which causes these so called 4 errors in the validator when you actually have one.

It can take time for you to see where this tag is missing, but it good to learn and how to spot errors in your html without me doing it for you.

Hope this Helps,
Ed

EDIT: With these errors, it usually is the first error you need to refer to. In this case, it was correct.