Andrew i am not expert and how can i find this error on my site ?
Line 568, Column 5: end tag for "ul" which is not finished
Most likely, you nested tags and closed them in the wrong order. For example <p>...</p> is not acceptable, as must be closed before <p>. Acceptable nesting is: <p>...</p>
Another possibility is that you used an element which requires a child element that you did not include. Hence the parent element is "not finished", not complete. For instance, in HTML the <head> element must contain a <title> child element, lists require appropriate list items (
- ; <dl> requires <dt> and <dd>), and so on.