IAE when adding SYM_ENCRYPT does not point the user in the right direction

08:08:40,847 ERROR [org.jboss.as.controller.management-operation] (management-handler-thread - 4) WFLYCTL0013: Operation ("add") failed - address: ([
    ("subsystem" => "jgroups"),
    ("stack" => "udp2"),
    ("protocol" => "SYM_ENCRYPT")
]): java.lang.IllegalArgumentException: newValue is null
	at org.jboss.dmr.ModelNode.set(ModelNode.java:664)
	at org.jboss.as.clustering.jgroups.subsystem.EncryptProtocolResourceDefinition$1.execute(EncryptProtocolResourceDefinition.java:146)
	at org.jboss.as.clustering.controller.AddStepHandler.populateModel(AddStepHandler.java:122)
	at org.jboss.as.controller.AbstractAddStepHandler.execute(AbstractAddStepHandler.java:145)
	at org.jboss.as.clustering.controller.AddStepHandler.execute(AddStepHandler.java:111)
	at org.jboss.as.clustering.controller.RestartParentResourceAddStepHandler.execute(RestartParentResourceAddStepHandler.java:45)
	at org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:979)
	at org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:722)
	at org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:441)
	at org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1397)
	at org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:421)
	at org.jboss.as.controller.ModelControllerImpl.lambda$execute$1(ModelControllerImpl.java:243)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:263)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:229)
	at org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:243)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.doExecute(ModelControllerClientOperationHandler.java:217)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler.access$400(ModelControllerClientOperationHandler.java:137)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1$1.run(ModelControllerClientOperationHandler.java:161)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1$1.run(ModelControllerClientOperationHandler.java:157)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:287)
	at org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:244)
	at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:254)
	at org.jboss.as.controller.AccessAuditContext.doAs(AccessAuditContext.java:225)
	at org.jboss.as.controller.remote.ModelControllerClientOperationHandler$ExecuteRequestHandler$1.execute(ModelControllerClientOperationHandler.java:157)
	at org.jboss.as.protocol.mgmt.ManagementRequestContextImpl$1.doExecute(ManagementRequestContextImpl.java:70)
	at org.jboss.as.protocol.mgmt.ManagementRequestContextImpl$AsyncTaskRunner.run(ManagementRequestContextImpl.java:160)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:745)
	at org.jboss.threads.JBossThread.run(JBossThread.java:320)