SimpleXPathAPI

[Jason Jesso]

I'm pretty doing what SimpleXPathAPI does (almost line by line).
When I run the SimpleXPathAPI it works fine, but when I run my program, 
I get:

./_foo _foo.xml itXML "/itXML/TX"
Assertion failed: manager != 0, file  XMemory.cpp, line 102
Abort(coredump)
I rounded it down to this line of code:
           // Parse the document...
           XalanDocument* const theDocument =
                 theLiaison.parseXMLStream(theInputSource);
Any ideas?