CMMN modeler and engine problem

I’ve deployed Flowable 6.3.1 through Apache tomcat. Trying to model the following model the Flowable BpmnJsonConverter (which by the way I’ve got no idea what it has to do with CMMN modeling) throws NullPointerException.Model
The generated xml is as follows.

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/CMMN/20151109/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:flowable="http://flowable.org/cmmn" xmlns:cmmndi="http://www.omg.org/spec/CMMN/20151109/CMMNDI" xmlns:dc="http://www.omg.org/spec/CMMN/20151109/DC" xmlns:di="http://www.omg.org/spec/CMMN/20151109/DI" targetNamespace="http://www.flowable.org/casedef">
  <case id="holidayRequest" name="HolidayRequest" flowable:initiatorVariableName="initiator">
    <casePlanModel id="casePlanModel" flowable:formKey="requestHoliday">
      <planItem id="planItem1" name="checkRequest" definitionRef="sid-0F1F1EF4-7661-4CC8-9AD7-4F2566DF989C">
        <entryCriterion id="sid-43F0EC01-FD2F-417C-9CC7-46F0F3141D40" sentryRef="sentry1"></entryCriterion>
      </planItem>
      <planItem id="planItem2" name="isCheckNeeded" definitionRef="sid-C7C05BD3-1D12-4060-9AE8-FD5E4CB9DF94">
        <itemControl>
          <requiredRule></requiredRule>
        </itemControl>
      </planItem>
      <sentry id="sentry1">
        <ifPart>
          <condition><![CDATA[${decisionNeeded == "true"}]]></condition>
        </ifPart>
      </sentry>
      <humanTask id="sid-0F1F1EF4-7661-4CC8-9AD7-4F2566DF989C" name="checkRequest" flowable:candidateUsers="admin,boss" flowable:formKey="checkHoliday"></humanTask>
      <decisionTask id="sid-C7C05BD3-1D12-4060-9AE8-FD5E4CB9DF94" name="isCheckNeeded" isBlocking="false">
        <extensionElements>
          <flowable:field name="decisionTaskThrowErrorOnNoHits">
            <flowable:string><![CDATA[false]]></flowable:string>
          </flowable:field>
        </extensionElements>
      </decisionTask>
    </casePlanModel>
  </case>
  <cmmndi:CMMNDI>
    <cmmndi:CMMNDiagram id="CMMNDiagram_holidayRequest">
      <cmmndi:CMMNShape id="CMMNShape_casePlanModel" cmmnElementRef="casePlanModel">
        <dc:Bounds height="424.0" width="580.0" x="40.0" y="40.0"></dc:Bounds>
        <cmmndi:CMMNLabel></cmmndi:CMMNLabel>
      </cmmndi:CMMNShape>
      <cmmndi:CMMNShape id="CMMNShape_planItem1" cmmnElementRef="planItem1">
        <dc:Bounds height="80.0" width="100.0" x="300.0" y="180.0"></dc:Bounds>
        <cmmndi:CMMNLabel></cmmndi:CMMNLabel>
      </cmmndi:CMMNShape>
      <cmmndi:CMMNShape id="CMMNShape_sid-43F0EC01-FD2F-417C-9CC7-46F0F3141D40" cmmnElementRef="sid-43F0EC01-FD2F-417C-9CC7-46F0F3141D40">
        <dc:Bounds height="22.0" width="14.0" x="292.58765691867626" y="227.54247101841793"></dc:Bounds>
        <cmmndi:CMMNLabel></cmmndi:CMMNLabel>
      </cmmndi:CMMNShape>
      <cmmndi:CMMNShape id="CMMNShape_planItem2" cmmnElementRef="planItem2">
        <dc:Bounds height="80.0" width="100.0" x="105.5" y="183.0"></dc:Bounds>
        <cmmndi:CMMNLabel></cmmndi:CMMNLabel>
      </cmmndi:CMMNShape>
      <cmmndi:CMMNEdge id="CMMNEdge_sid-BDE0FC41-0461-4EAB-93E8-4E3E19709E7B" cmmnElementRef="sid-C7C05BD3-1D12-4060-9AE8-FD5E4CB9DF94" targetCMMNElementRef="sid-0F1F1EF4-7661-4CC8-9AD7-4F2566DF989C">
        <di:waypoint x="205.44999999999806" y="222.2287917737789"></di:waypoint>
        <di:waypoint x="299.99999999999847" y="220.77043701799485"></di:waypoint>
        <cmmndi:CMMNLabel></cmmndi:CMMNLabel>
      </cmmndi:CMMNEdge>
    </cmmndi:CMMNDiagram>
  </cmmndi:CMMNDI>
</definitions>

what do I have to do to fix it?

P.S. I previously had this problem and when I’ve tried to deploy it’s app it used to throw an Exception saying about ‘extensionElement’ tag and the fact that it should not have child! but now it deploys without any exception.

EDIT: I’ve figured out the decision table reference was null so when I changed it to point out the decision table I got the same exception I mentioned previously in P.S. part. It’s a CmmnXMLException. The stack-trace summary is as follows.

ERROR 19300 — [nio-8090-exec-8]
o.f.u.m.s.ModelImageService : Error creating thumbnail
cmmn image 073fbc3d-b36b-11e8-ae0a-005056c00008
java.lang.NullPointerException: null at
org.flowable.cmmn.image.impl.DefaultCaseDiagramGenerator.connectionPerfectionizer(DefaultCaseDiagramGenerator.java:393)
~[flowable-cmmn-image-generator-6.3.1.jar:6.3.1] at
org.flowable.cmmn.image.impl.DefaultCaseDiagramGenerator.drawAssociation(DefaultCaseDiagramGenerator.java:369)
~[flowable-cmmn-image-generator-6.3.1.jar:6.3.1] at
org.flowable.cmmn.image.impl.DefaultCaseDiagramGenerator.generateCaseDiagram(DefaultCaseDiagramGenerator.java:261)
~[flowable-cmmn-image-generator-6.3.1.jar:6.3.1] at
org.flowable.cmmn.image.impl.DefaultCaseDiagramGenerator.generateImage(DefaultCaseDiagramGenerator.java:222)
~[flowable-cmmn-image-generator-6.3.1.jar:6.3.1] at
org.flowable.cmmn.image.impl.DefaultCaseDiagramGenerator.generateImage(DefaultCaseDiagramGenerator.java:227)
~[flowable-cmmn-image-generator-6.3.1.jar:6.3.1] at
org.flowable.cmmn.image.impl.DefaultCaseDiagramGenerator.generatePngImage(DefaultCaseDiagramGenerator.java:232)
~[flowable-cmmn-image-generator-6.3.1.jar:6.3.1]

ERROR 19300 — [nio-8090-exec-8]
o.f.c.e.i.i.CommandContext: Error while closing command
context

org.flowable.cmmn.converter.CmmnXMLException: cvc-complex-type.2.4.d:
Invalid content was found starting with element ‘extensionElements’.
No child element is expected at this point. at
org.flowable.cmmn.converter.CmmnXmlConverter.convertToCmmnModel(CmmnXmlConverter.java:173)
~[flowable-cmmn-converter-6.3.1.jar:6.3.1] at
org.flowable.cmmn.engine.impl.parser.CmmnParserImpl.parse(CmmnParserImpl.java:89)
~[flowable-cmmn-engine-6.3.1.jar:6.3.1] at
org.flowable.cmmn.engine.impl.parser.CmmnParserImpl.parse(CmmnParserImpl.java:67)
~[flowable-cmmn-engine-6.3.1.jar:6.3.1]
Caused by:
org.xml.sax.SAXParseException: cvc-complex-type.2.4.d: Invalid content
was found starting with element ‘extensionElements’. No child element
is expected at this point. at
org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown
Source) ~[xercesImpl-2.10.0.jar:?]

ERROR 19300 — [nio-8090-exec-2]
o.f.u.m.s.AppDefinitionPublishService : Invalid deploy result code:
HTTP/1.1 500

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