If I try to import this bpmn2 file the same exception is thrown....
<?xml version="1.0" encoding="UTF-8"?>
<bpmn2:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.omg.org/bpmn20" 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:drools="http://www.jboss.org/drools" xmlns:bpmn2="http://www.omg.org/spec/BPMN/20100524/MODEL" id="_ajfusL6kEeGu7JFDIJJYNA" xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd" targetNamespace="http://www.omg.org/bpmn20">
<bpmn2:process id="defaultPackage.prueba" drools:packageName="defaultPackage" name="prueba" isExecutable="true">
<bpmn2:startEvent id="_9A0B2535-5CD8-4D50-A44A-7B86F16D65B1" drools:bgcolor="#9acd32" name="">
<bpmn2:outgoing>_E37EF4C3-F15A-467C-B6EF-A409D12440C4</bpmn2:outgoing>
</bpmn2:startEvent>
<bpmn2:userTask id="_4E540621-EC4D-41E7-BF66-1911258F9141" drools:bgcolor="#fafad2" drools:taskName="TaskName" drools:scriptFormat="http://www.java.com/java" name="">
<bpmn2:incoming>_E37EF4C3-F15A-467C-B6EF-A409D12440C4</bpmn2:incoming>
<bpmn2:outgoing>_AC6B8FC3-31D2-4D21-8E48-6886EE7DCF88</bpmn2:outgoing>
<bpmn2:ioSpecification id="_ajgVwL6kEeGu7JFDIJJYNA">
<bpmn2:dataInput id="_4E540621-EC4D-41E7-BF66-1911258F9141_TaskNameInput" name="TaskName"/>
<bpmn2:inputSet id="_ajgVwb6kEeGu7JFDIJJYNA"/>
<bpmn2:outputSet id="_ajgVwr6kEeGu7JFDIJJYNA"/>
</bpmn2:ioSpecification>
<bpmn2:dataInputAssociation id="_ajgVw76kEeGu7JFDIJJYNA">
<bpmn2:targetRef>_4E540621-EC4D-41E7-BF66-1911258F9141_TaskNameInput</bpmn2:targetRef>
<bpmn2:assignment id="_ajgVxL6kEeGu7JFDIJJYNA">
<bpmn2:from xsi:type="bpmn2:tFormalExpression" id="_ajgVxb6kEeGu7JFDIJJYNA">TaskName</bpmn2:from>
<bpmn2:to xsi:type="bpmn2:tFormalExpression" id="_ajgVxr6kEeGu7JFDIJJYNA">_4E540621-EC4D-41E7-BF66-1911258F9141_TaskNameInput</bpmn2:to>
</bpmn2:assignment>
</bpmn2:dataInputAssociation>
<bpmn2:resourceRole xsi:type="bpmn2:tPotentialOwner" id="_ajgVx76kEeGu7JFDIJJYNA">
<bpmn2:resourceAssignmentExpression id="_ajgVyL6kEeGu7JFDIJJYNA">
<bpmn2:expression xsi:type="bpmn2:tFormalExpression" id="_ajgVyb6kEeGu7JFDIJJYNA">mina</bpmn2:expression>
</bpmn2:resourceAssignmentExpression>
</bpmn2:resourceRole>
</bpmn2:userTask>
<bpmn2:sequenceFlow id="_E37EF4C3-F15A-467C-B6EF-A409D12440C4" sourceRef="_9A0B2535-5CD8-4D50-A44A-7B86F16D65B1" targetRef="_4E540621-EC4D-41E7-BF66-1911258F9141"/>
<bpmn2:businessRuleTask id="_A8DBF4EC-0B61-46A2-AB0E-56D48537E1F5" drools:bgcolor="#fafad2" drools:ruleFlowGroup="validacionesFinales" name="">
<bpmn2:incoming>_AC6B8FC3-31D2-4D21-8E48-6886EE7DCF88</bpmn2:incoming>
<bpmn2:outgoing>_9A5333FC-C0EE-4E76-9233-1211BCAD7CD0</bpmn2:outgoing>
</bpmn2:businessRuleTask>
<bpmn2:sequenceFlow id="_AC6B8FC3-31D2-4D21-8E48-6886EE7DCF88" sourceRef="_4E540621-EC4D-41E7-BF66-1911258F9141" targetRef="_A8DBF4EC-0B61-46A2-AB0E-56D48537E1F5"/>
<bpmn2:endEvent id="_F5E1B62B-A2A8-4677-9085-03209839ACFA" drools:bgcolor="#ff6347" name="">
<bpmn2:incoming>_9A5333FC-C0EE-4E76-9233-1211BCAD7CD0</bpmn2:incoming>
</bpmn2:endEvent>
<bpmn2:sequenceFlow id="_9A5333FC-C0EE-4E76-9233-1211BCAD7CD0" sourceRef="_A8DBF4EC-0B61-46A2-AB0E-56D48537E1F5" targetRef="_F5E1B62B-A2A8-4677-9085-03209839ACFA"/>
</bpmn2:process>
<bpmndi:BPMNDiagram id="_ajgVyr6kEeGu7JFDIJJYNA">
<bpmndi:BPMNPlane id="_ajgVy76kEeGu7JFDIJJYNA" bpmnElement="defaultPackage.prueba">
<bpmndi:BPMNShape id="_ajgVzL6kEeGu7JFDIJJYNA" bpmnElement="_9A0B2535-5CD8-4D50-A44A-7B86F16D65B1">
<dc:Bounds height="30.0" width="30.0" x="138.0" y="102.0"/>
</bpmndi:BPMNShape>
<bpmndi:BPMNShape id="_ajgVzb6kEeGu7JFDIJJYNA" bpmnElement="_4E540621-EC4D-41E7-BF66-1911258F9141">
<dc:Bounds height="80.0" width="100.0" x="213.0" y="77.0"/>
</bpmndi:BPMNShape>
<bpmndi:BPMNEdge id="_ajgVzr6kEeGu7JFDIJJYNA" bpmnElement="_E37EF4C3-F15A-467C-B6EF-A409D12440C4">
<di:waypoint xsi:type="dc:Point" x="153.0" y="117.0"/>
<di:waypoint xsi:type="dc:Point" x="263.0" y="117.0"/>
</bpmndi:BPMNEdge>
<bpmndi:BPMNShape id="_ajgVz76kEeGu7JFDIJJYNA" bpmnElement="_A8DBF4EC-0B61-46A2-AB0E-56D48537E1F5">
<dc:Bounds height="80.0" width="100.0" x="358.0" y="77.0"/>
</bpmndi:BPMNShape>
<bpmndi:BPMNEdge id="_ajgV0L6kEeGu7JFDIJJYNA" bpmnElement="_AC6B8FC3-31D2-4D21-8E48-6886EE7DCF88">
<di:waypoint xsi:type="dc:Point" x="263.0" y="117.0"/>
<di:waypoint xsi:type="dc:Point" x="408.0" y="117.0"/>
</bpmndi:BPMNEdge>
<bpmndi:BPMNShape id="_ajgV0b6kEeGu7JFDIJJYNA" bpmnElement="_F5E1B62B-A2A8-4677-9085-03209839ACFA">
<dc:Bounds height="28.0" width="28.0" x="503.0" y="103.0"/>
</bpmndi:BPMNShape>
<bpmndi:BPMNEdge id="_ajgV0r6kEeGu7JFDIJJYNA" bpmnElement="_9A5333FC-C0EE-4E76-9233-1211BCAD7CD0">
<di:waypoint xsi:type="dc:Point" x="408.0" y="117.0"/>
<di:waypoint xsi:type="dc:Point" x="517.0" y="117.0"/>
</bpmndi:BPMNEdge>
</bpmndi:BPMNPlane>
</bpmndi:BPMNDiagram>
</bpmn2:definitions>