Are you sure you're looking at correct lines? When you go to validator page, click "Show Source" and then the button to revalidate. Then, on the source they provide for you, copy and paste the line(s) according to the line numbers they give. Their line numbers aren't the same as your project line numbers or your page (browser) source line numbers. If this really is the correct line(s), then I have no idea. The error you're getting means that you didn't close a tag somewhere, but you obviously did with the code you showed me, so that's why I feel like it's something with different lines. Let me know!
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