java.lang.NullPointerException: Cannot invoke "Object.toString()" because the return value of "com.inductiveautomation.sfc.api.PyChartScope.get(Object)" is null
at com.inductiveautomation.sfc.elements.SfcTagReferenceLocation.from(SfcTagReferenceLocation.java:47)
at com.inductiveautomation.sfc.elements.steps.begin.BeginStep.activateStep(BeginStep.java:44)
at com.inductiveautomation.sfc.elements.StepContainer.onActivateRequested(StepContainer.java:145)
at com.inductiveautomation.sfc.fsm.element.ElementInactive.action(ElementInactive.java:35)
at com.inductiveautomation.sfc.fsm.element.ElementInactive.action(ElementInactive.java:8)
at com.inductiveautomation.sfc.fsm.StateContext.lambda$handleEvent$0(StateContext.java:49)
at com.inductiveautomation.sfc.api.ExecutionQueue$ThrowableCatchingRunnable.run(ExecutionQueue.java:146)
at com.inductiveautomation.sfc.api.ExecutionQueue$PollAndExecute.run(ExecutionQueue.java:120)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
can you please what will be the cause for this error.
The payload which i am passing to startchart as below:
"{'parent': {'parent': {'parent': {'isolationMode': False, 'project': u'LTI_Site', 'originator': u'admin', 'msgQueue': 'SFC', 'activeSteps': {'fakeUUID': {'name': u'pro'}}, 'tagProvider': u'ARTIE', 'database': u'ARTIE', 'instanceId': 'mockId', 'controlPanelName': 'Designer', 'timeFactor': 1.0, 'controlParameterId': 5, 'chartPath': u'PV_Monitor/Procedure'}, 'enclosingStep': {'s88Level': 'global', 'runningTime': 0.0, 'name': u'pro'}, 'activeSteps': {'fakeUUID': {'name': u'op'}}, 'chartPath': u'PV_Monitor/Operation'}, 'enclosingStep': {'s88Level': 'operation', 'runningTime': 0.0, 'name': u'op'}, 'activeSteps': {'fakeUUID': {'name': u'ph'}}, 'chartPath': u'PV_Monitor/Phase'}, 'enclosingStep': {'s88Level': 'phase', 'runningTime': 0.0, 'name': u'ph'}}"