Hi Ryan,
I have seen issues like this before. Unfortunately, sometimes the KML/KMZ is just corrupt with no hope when you get an error like that.
Though, you could attempt to check it out to see what the error is saying on that line. Since it is a KMZ, you will have to unzip it to get to the KML. Then you can open it up and read the code text, etc.
This article shows some suggestions on how to do this:
google - Corrupted kmz file with parse error? - Geographic Information Systems Stack Exchange