Problem with Schema validation in XercesXMLParser

Hi All Great Hackers

I have strange problem. I need to validate an xml file using Schema.
(Xerces (C++) XML parser v. 2.3 on Debian GNU/Linux) I,ve written something like this:

XercesDOMParser *parser=new XercesDOMParser();

MyDOMErrorHandler* errHandler = new MyDOMErrorHandler(); //MyDOMErrorHandler is defined elsewhere of course
parser->setErrorHandler((ErrorHandler *)errHandler);
DOMDocument *doc;

try {
parser->setValidationScheme(XercesDOMParser::Val_Always);
parser->loadGrammar(settings.getOption("grammar_file.xsd"),Grammar::SchemaGrammarType,true);
parser->useCachedGrammarInParse(true);
parser->parse("my_file.xml");

and this program breaks at this point and I get a message:

Illegal instruction

I tried to debug that with gdb but without any result.
What's the problem?

thanx in advance

Cinek