what you did was partially correct in the first place however you deleted a tag that you shouldn't have
what you want to delete is all the unwanted book marks
everything between <bookmark> to </bookmark>, i reckon you must have left a <bookmark> or a </bookmark> in your haste
99% of the xml related errors are because people don't take care in editng the xml correctly.
before you ftp but after editing open the xml in internet explorer or firefox (or any other Internet browser) if it opens fine, then you're ok- you can ftp it across
if there are anny tag errors (e.g. say you accidently deleted </video> then an error will come up in your internet browser, and it will even tell you what line its on .
if you use a text editor more advanced than notepad it is then relatively easy to correct the problem