It looks like this is my main error:
Line 346, Column 27: document type does not allow element "div" here; missing one of "object", "ins", "del", "map", "button" start-tag
The mentioned element is not allowed to appear in the context in which you've placed it; the other mentioned elements are the only ones that are both allowed there and can contain the element mentioned. This might mean that you need a containing element, or possibly that you've forgotten to close a previous element.
One possible cause for this message is that you have attempted to put a block-level element (such as "<p>" or "<table>") inside an inline element (such as "<a>", "<span>", or "<font>").
Not sure how to go about fixing that though.