Kie server Issue KieServicesHttpException: Unexpected HTTP response code when requesting URI

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Hello All,

Recently I have Upgrades PAM from 12.0 to 13.0 with JBOSS 7.4.2/JBOSS 7.4.5
I am able to create simple process instance but getting issue while playing with parent/sub process instance creation as below.
Note:
1. PAM 12.0 with JBOSS EAP 7.4.2 working fine in both the cases
2. PAM 13.0 showing below exception for both JBOSS 7.4.2 and JBOSS 7.4.5
3. No Change in BPMN project during upgrade.

error is when calling from my java class:

Caused by: org.kie.server.api.exception.KieServicesHttpException: Unexpected HTTP response code when requesting URI 'https://localhost:8443/kie-server/services/rest/server/containers/com.sopra.banking.processengine:sopra-banking-processengine-it:3.1.2/processes/HelloWorld.ParentProcess/instances'! Error code: 500, message: "Unable to create response: [HelloWorld.ParentProcess:27 - Sub-Process:6] -- "
at org.kie.server.client.impl.AbstractKieServicesClientImpl.createExceptionForUnexpectedResponseCode(AbstractKieServicesClientImpl.java:667)
at org.kie.server.client.impl.AbstractKieServicesClientImpl.makeHttpPostRequestAndCreateCustomResponse(AbstractKieServicesClientImpl.java:364)
at org.kie.server.client.impl.AbstractKieServicesClientImpl.makeHttpPostRequestAndCreateCustomResponse(AbstractKieServicesClientImpl.java:344)
at org.kie.server.client.impl.ProcessServicesClientImpl.startProcess(ProcessServicesClientImpl.java:309)

Could you have any clue ? Thanks in advance for any kind of help.

let me know if any other information is required.

Regards

DS

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