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That’s a warning that says the XML doesn’t validate. There’s probably junk in there from a chapter. Share the file?
that´s the file:
xmllint pb-xml
:12274: parser error : Char 0x0 out of allowed range
n eclectic system with a distribution of contents based on the Learning Objects.
^
… snip …
Unicode character 0x0
represents NULL
meaning that the data you’re pulling contains a NULL somewhere (which is not allowed in XML and hence your error). An invisible character that, somehow, got into your chapter. Delete it, the problem will go away.