umm does the file work? is that ONE part of a single source or is that the entire file for the source.
Generally, that is an XML formatting error which indicates you have stuff in the wrong place....
For example,
Code:
<tag>boo
<subtag>blah</subtag>
</tag>
In this very simple example, tag is supposed to ONLY contain child tags and not "real" data. Now... I am not 100% sure that's what this is exactly complaining about, but that is the type of thing I could see validation code checking against.
Best thing would be to link to google drive or dropbox if the file is very large or post here if it's smallish.