I inherited some code that is using XPath for which I am a novice. I have it now so that it loads the document, but when the document.selectPath(queryPath) it always fails with the following error:
````
java.lang.RuntimeException:  Trying XBeans path engine... Trying XQRL... Trying delegated path engine... FAILED on //
        at org.apache.xmlbeans.impl.store.Path.getCompiledPath(Path.java:173)
        at org.apache.xmlbeans.impl.store.Path.getCompiledPath(Path.java:130)
        at org.apache.xmlbeans.impl.store.Cursor._selectPath(Cursor.java:902)
        at org.apache.xmlbeans.impl.store.Cursor.selectPath(Cursor.java:2634)
        at org.apache.xmlbeans.impl.values.XmlObjectBase.selectPath(XmlObjectBase.java:462)
        at org.apache.xmlbeans.impl.values.XmlObjectBase.selectPath(XmlObjectBase.java:446)

````