3439791 - "Error during shutdown: 'SendStateSocket' object has no attribute 'conn'" - SAP Data Intelligence

Cannot run a ML pipeline which uses Jupyter operator. Below error is reported:

"message": "Group messages:\n Group: default; Messages: error building graph: error during init of process: component=com.sap.system.process.subengineOperator process=subengineOperator0: subengine operator init error: timed out waiting for sub-engine status; the following error also happened during shutdown: error while stopping 'com.sap.python36' sub-engine: expected status code 200 but got 500: \"Unexpected error while stopping graph: Error during shutdown: 'SendStateSocket' object has no attribute 'conn'\"\n Process(es) terminated with error(s). restartOnFailure==false\n",

SAP Data Intelligence - Cloud Edition 

KBA , CA-DI , Data Intelligence , Problem