VariableScopes can only resolve variable names - RHPAM

Issue

• Receiving the error below when output variables configured for the workitem.

Caused by: java.lang.IllegalArgumentException: VariableScopes can only resolve variable names: null
    at org.jbpm.process.core.context.variable.VariableScope.resolveContext(VariableScope.java:93) ~[jbpm-flow-7.73.0.Final.jar:7.73.0.Final]
    at org.jbpm.process.core.impl.ProcessImpl.resolveContext(ProcessImpl.java:138) ~[jbpm-flow-7.73.0.Final.jar:7.73.0.Final]
    at org.jbpm.workflow.core.impl.NodeImpl.resolveContext(NodeImpl.java:292) ~[jbpm-flow-7.73.0.Final.jar:7.73.0.Final]
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.resolveContext(NodeInstanceImpl.java:449) ~[jbpm-flow-7.73.0.Final.jar:7.73.0.Final]
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.resolveContextInstance(NodeInstanceImpl.java:461) ~[jbpm-flow-7.73.0.Final.jar:7.73.0.Final]
    at org.jbpm.workflow.instance.impl.NodeInstanceImpl.getVariable(NodeInstanceImpl.java:507) ~[jbpm-flow-7.73.0.Fin