What's the problem?

I dont know the problem in code.

protected Dialog onCreateDialog(int id, Context ctx) {

FileInputStream istream = null;
try {
istream = (FileInputStream) ctx.getResources().openRawResource(R.xml.sample);

/* Get a SAXParser from the SAXPArserFactory. */
SAXParserFactory spf = SAXParserFactory.newInstance();
SAXParser sp = spf.newSAXParser();
/* Get the XMLReader of the SAXParser we created. */
XMLReader xr = sp.getXMLReader();
/* Create a new ContentHandler and apply it to the XML-Reader*/
ExampleHandler myExampleHandler = new ExampleHandler();
xr.setContentHandler(myExampleHandler);
/* Parse the xml-data from our URL. */
xr.parse(new InputSource(istream));
/* Parsing has finished. */

/* Our ExampleHandler now provides the parsed data to us. */
ParsedExampleDataSet parsedExampleDataSet = myExampleHandler.getParsedData();

switch (id) {
case DIALOG_MESSAGE:
return new AlertDialog.Builder(MainMenu.this)
//.setIcon(R.drawable.dialog_icon)
.setTitle("Test set text from local file"
.setMessage(parsedExampleDataSet.toString1())
.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {

/* User clicked OK so do some stuff */
}
})
.setNeutralButton("Something", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {

/* User clicked Something so do some stuff */
}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {

/* User clicked Cancel so do some stuff */
}
})
.create();
}
}
catch (Exception e){
e.getMessage();
}
return null;
}