ITunes will not accept XML File

Question

Hello,
I have been trying to upload my normal weekly xml file and iTunes won't accept it.  In the past, I copy and paste the previous entry in the xml file, make the upates (name of file, length, date, title, etc.) and then upload the updated file.  Been doing that for years.  Now, for the last six weeks, I have to recopy the previous week's entry, make the updates and save numerous times.  Sometimes iTunes will accept it, sometimes it doesn't.  Is there a limit of how many lines you can have in an xml file?  When I try to validate it, http://validator.w3.org, i get the following error:
line 8185, column 2: XML parsing error: <unknown>:8185:2: mismatched tag [help]
</channel>
There is a <channel> on line 05, so this error doesn't make sense to me.
Can someone please take a look at the file and help me figure out the problem?  I would appreciate it.
Here is the link:  http://graceplace.org/media/audio/podcast.xml
Thank you!

Answer 1

The problem is just before your first 'item' tag:
<itunes:category text="Religion &amp; Spirituality">
<itunes:category text="Christianity">
</itunes:category>
<item>
In the second line quoted above, you have not closed the tag, so that everything for the rest of the feed is seen as being within that tag - including the closing 'channel' tag, which is where the error has been flagged,
Those lines should read
<itunes:category text="Religion &amp; Spirituality">
<itunes:category text="Christianity" />
</itunes:category>
<item>