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I am posting my bpmn process for more info:

<?xml version="1.0" encoding="UTF-8"?>

<definitions id="Definition"

             targetNamespace="http://www.jboss.org/drools"

             typeLanguage="http://www.java.com/javaTypes"

             expressionLanguage="http://www.mvel.org/2.0"

             xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"

             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

             xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd"

             xmlns:g="http://www.jboss.org/drools/flow/gpd"

             xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"

             xmlns:dc="http://www.omg.org/spec/DD/20100524/DC"

             xmlns:di="http://www.omg.org/spec/DD/20100524/DI"

             xmlns:tns="http://www.jboss.org/drools">

  <itemDefinition id="_permissionRequestItem" structureRef="com.google.partnerservices.simba.bo.PermissionRequestItem" />

  <process processType="Private" isExecutable="true" id="com.google.simba.permissionRequest" name="PermissionRequest" tns:packageName="defaultPackage" >

    <!-- process variables -->

    <property id="approver" itemSubjectRef="_approverItem"/>

    <property id="description" itemSubjectRef="_descriptionItem"/>

    <property id="permissionRequestItems" itemSubjectRef="_permissionRequestItem"/>   

    <property id="actor" itemSubjectRef="_actor"/>

    <!-- nodes -->

    <startEvent id="_1" name="Start" />

    <task id="_2" name="Send Permission Request" tns:taskName="sendPermissionRequest" >

      <ioSpecification>

        <dataInput id="approver" name="approver" />

        <dataInput id="description" name="description" />

        <dataInput id="permissionRequestItems" name="permissionRequestItems" />

        <dataOutput id="actorId" name="actorId" />

        <inputSet>

          <dataInputRefs>approver</dataInputRefs>

          <dataInputRefs>description</dataInputRefs>

          <dataInputRefs>permissionRequestItems</dataInputRefs>

        </inputSet>

        <outputSet>

          <dataOutputRefs>actorId</dataOutputRefs>

        </outputSet>

      </ioSpecification>

      <dataInputAssociation>

        <sourceRef>approver</sourceRef>

        <targetRef>approver</targetRef>

      </dataInputAssociation>

      <dataInputAssociation>

        <sourceRef>description</sourceRef>

        <targetRef>description</targetRef>

      </dataInputAssociation>

      <dataInputAssociation>

        <sourceRef>permissionRequestItems</sourceRef>

        <targetRef>permissionRequestItems</targetRef>

      </dataInputAssociation>

      <dataOutputAssociation>

        <sourceRef>actorId</sourceRef>

        <targetRef>actor</targetRef>

      </dataOutputAssociation>

    </task>

<userTask id="_4" name="Manager Approval" >

      <ioSpecification>

        <dataInput id="_4_SkippableInput" name="Skippable" />

        <dataInput id="_4_TaskNameInput" name="TaskName" />

        <dataInput id="ActorId" name="ActorId" />

        <inputSet>

          <dataInputRefs>_4_SkippableInput</dataInputRefs>

          <dataInputRefs>_4_TaskNameInput</dataInputRefs>

          <dataInputRefs>ActorId</dataInputRefs>

        </inputSet>

        <outputSet>

        </outputSet>

      </ioSpecification>

      <dataInputAssociation>

        <targetRef>_4_SkippableInput</targetRef>

        <assignment>

          <from xsi:type="tFormalExpression">false</from>

          <to xsi:type="tFormalExpression">_4_SkippableInput</to>

        </assignment>

      </dataInputAssociation>

      <dataInputAssociation>

        <targetRef>_4_TaskNameInput</targetRef>

        <assignment>

          <from xsi:type="tFormalExpression">Manager Decision</from>

          <to xsi:type="tFormalExpression">_4_TaskNameInput</to>

        </assignment>

      </dataInputAssociation>

      <dataInputAssociation>

        <sourceRef>actor</sourceRef>

        <targetRef>ActorId</targetRef>

      </dataInputAssociation>

      <potentialOwner>

        <resourceAssignmentExpression>

          <formalExpression></formalExpression>

        </resourceAssignmentExpression>

      </potentialOwner>

    </userTask>

    <endEvent id="_7" name="End" >

        <terminateEventDefinition/>

    </endEvent>

    <!-- connections -->

    <sequenceFlow id="_1-_2" sourceRef="_1" targetRef="_2" />

    <sequenceFlow id="_2-_4" sourceRef="_2" targetRef="_4" />

    <sequenceFlow id="_4-_7" sourceRef="_4" targetRef="_7" />

  </process>

  <bpmndi:BPMNDiagram>

    <bpmndi:BPMNPlane bpmnElement="com.google.simba.permissionRequest" >

      <bpmndi:BPMNShape bpmnElement="_1" >

        <dc:Bounds x="404" y="23" width="48" height="48" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape bpmnElement="_2" >

        <dc:Bounds x="309" y="231" width="248" height="48" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape bpmnElement="_4" >

        <dc:Bounds x="319" y="399" width="246" height="48" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNShape bpmnElement="_7" >

        <dc:Bounds x="420" y="619" width="48" height="48" />

      </bpmndi:BPMNShape>

      <bpmndi:BPMNEdge bpmnElement="_1-_2" >

        <di:waypoint x="428" y="47" />

        <di:waypoint x="433" y="255" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge bpmnElement="_2-_4" >

        <di:waypoint x="433" y="255" />

        <di:waypoint x="442" y="423" />

      </bpmndi:BPMNEdge>

      <bpmndi:BPMNEdge bpmnElement="_4-_7" >

        <di:waypoint x="442" y="423" />

        <di:waypoint x="444" y="643" />

      </bpmndi:BPMNEdge>

    </bpmndi:BPMNPlane>

  </bpmndi:BPMNDiagram>

</definitions>

The error does not occur if I remove the user task named 'Manager Approval'. I would appreciate any help in understanding what the cause of this is.