error during running areal source PSHA

[Chaman S]

I am a new user of oq engine and trying to calculate the seismic hazard of maharashtra by Areal source in PSHA, India. but facing problem in source file, while running job.ini, i am getting following error consistently 

TypeError: node truncGutenbergRichterMFD: '>' not supported between instances of 'NoneType' and 'int', line 42 of  sources.xml

i am attaching my calculation files 

please help

<?xml version="1.0" encoding="UTF-8"?>
<nrml xmlns="http://openquake.org/xmlns/nrml/0.5"
      xmlns:gml="http://www.opengis.net/gml">

  <sourceModel name="Maharashtra_Area_Model">

    <sourceGroup name="Maha_Group"
                 tectonicRegion="Active Shallow Crust">

      <areaSource id="AS01"
                  name="Maharashtra"
                  tectonicRegion="Active Shallow Crust">

        <!-- Geometry -->
        <areaGeometry>
          <gml:Polygon>
            <gml:exterior>
              <gml:LinearRing>
                <gml:posList>
                  72.0 16.0
                  80.0 16.0
                  80.0 22.0
                  72.0 22.0
                  72.0 16.0
                </gml:posList>
              </gml:LinearRing>
            </gml:exterior>
          </gml:Polygon>
        </areaGeometry>

        <!-- Seismogenic depths -->
        <upperSeismoDepth>0.0</upperSeismoDepth>
        <lowerSeismoDepth>20.0</lowerSeismoDepth>

        <!-- REQUIRED: Magnitude Scaling Relation -->
        <magScaleRel>WC1994</magScaleRel>

        <!-- REQUIRED: Rupture Aspect Ratio -->
        <ruptAspectRatio>1.0</ruptAspectRatio>

        <!-- Magnitude Frequency Distribution -->
        <truncGutenbergRichterMFD
            aValue="4.5"
            bValue="0.9"
            minMag="4.0"
            maxMag="7.0"
            binWidth="0.1"/>

        <!-- Nodal plane distribution -->
        <nodalPlaneDist>
          <nodalPlane probability="1.0"
                      strike="0.0"
                      dip="90.0"
                      rake="0.0"/>
        </nodalPlaneDist>

        <!-- Hypocentral depth distribution -->
        <hypoDepthDist>
          <hypoDepth probability="1.0"
                     depth="10.0"/>
        </hypoDepthDist>

      </areaSource>

    </sourceGroup>

  </sourceModel>
</nrml>

[marco....@globalquakemodel.org]

Please follow the example in the demo https://github.com/gem/oq-engine/blob/master/demos/hazard/AreaSourceClassicalPSHA/source_model.xml

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