Exception thrown when loading a concept using Cluster.DataGrid.CacheLoadConceptByExtIdByUri()

<timestamp> <agent> Error [<thread>] - [runtime.service] [Inference-classScheduler] Got runtime exception while executing Rule be.gen.Rules.loadConcept(Rules.loadConcept) Action be.gen.Rules.loadConcept$loadConcept_a@6178d113 Objects <be.gen.Events.testSupport@id=5>
java.lang.NullPointerException
        at com.tibco.be.functions.cluster.DataGridFunctions.CacheLoadConceptByExtIdByUri(SourceFile:465)
        at be.gen.Rules.loadConcept$loadConcept_a.execute(loadConcept.java:31)
        at com.tibco.cep.kernel.core.rete.ReteWM.resolveConflict(ReteWM.java:401)
        at com.tibco.cep.kernel.core.rete.ReteWM.resolveConflict(ReteWM.java:377)
        at com.tibco.cep.kernel.core.rete.ReteWM.fireRepeatEvent(ReteWM.java:2208)
        at com.tibco.cep.runtime.service.time.BETimeManager$RepeatTimeEventTask.execute(BETimeManager.java:280)
        at com.tibco.cep.kernel.helper.HiResTimer$HiResTimerThread.mainLoop(HiResTimer.java:287)
        at com.tibco.cep.kernel.helper.HiResTimer$HiResTimerThread.run(HiResTimer.java:224)

Exception thrown when load a concept using Cluster.DataGrid.CacheLoadConceptByExtIdByUri()

All Operating Systems

In CDD file Cache is disabled (ObjectManagement set to "Memory Only"). 
Cluster.DataGrid.<...> catalog functions can be used only when cache is enabled in the project.

To fix the issue either update ObjectManagement and enable Cache 
or 
use Instance.getByExtId() catalog function to load the concept in Rule/RuleFunction.