Error when extract policy cost

[debibooo]

Hi, I'm trying to extract policy cost results using gcamreader, but errors happen when applying runQuery. The query file is modified ref to example_queries and shows as follows:

<?xml version="1.0" encoding="UTF-8"?>
<queries>
  <queryGroup name="Policy Costs">
     <aQuery>
       <all-regions/>
         <costCurveQuery title="Policy Cost By Period">
            <axis1 name="Region">Curve</axis1>
            <axis2 name="Year">DataPoint</axis2>
            <xPath buildList="true" dataName="Cost" group="false" sumAll="false">PointSet/DataPoint/y/text()</xPath>
            <comments/>
         </costCurveQuery>
    </aQuery> 
  </queryGroup> 
</queries>   

the error when I run gcamreader:

I appreciate any suggestions and help to solve it!