Topic 4413 breaks building of the EAP 6 Alpha because of a mismatched tag error. I think the problem is that there is a DTD header inside the CDATA.
Fixed in 20110915-0830
The issue is that the error page includes the original XML in a cdata section. This was causing problems if the original XML already had a cdata section, because they can not be nested.
The end cdata tag in the original XML ]]> is now replaced with ]]> when included in the error page.