#7 Error reading XML content: not well-formed (invalid token)

[mgarnhum]

I get the following error on build. any suggestions?

Building category '44' failed: Build error in template
'Category Archive': Error in <MTEntries> tag: Error in
<MTTagInvoke> tag: Error reading XML content: not
well-formed (invalid token) at line 24, column 19, byte
907 at
/usr/lib/perl5/site_perl/5.8.4/i686-linux/XML/Parser.pm
line 187 .