Message: "XPath error : Invalid or inclomplete [sic?] context"

I am using Debian GNU/Linux 2.6.8-3-686-smp with
* xsltproc was compiled against libxml 20616, libxslt 10112 and libexslt 810
  - libxslt 10112 was compiled against libxml 20616
  - libexslt 810 was compiled against libxml 20616

Somehow, recently new error Messages appear when
creating HTML and ONEHTML, but not for "fo":
"XPath error : Invalid or inclomplete [sic?] context"

Any clue?
Thank you,

-- 
EL6: Euis Luhuanam