I went here - example.com/qp/ld

And got these error:

Notice: Undefined index: uri in querypath_examples_show_ld() (line 424 of /DRUPAL7/sites/all/modules/querypath/querypath_examples.module).
x
QueryPathParseException: DOMDocument::loadXML() [<a href='domdocument.loadxml'>domdocument.loadxml</a>]: EntityRef: expecting ';' in Entity, line: 90 (/DRUPAL7/sites/all/modules/querypath/QueryPath/QueryPath.php: 3781) in QueryPathParseException::initializeFromError() (line 4385 of /DRUPAL7/sites/all/modules/querypath/QueryPath/QueryPath.php).

I did get a useful message:

Using default resource: The Beatles.

but, mostly I'm getting an error page.