ClassNotFoundException when creating singleton service via SingletonPolicy

&amp#27;[0m&amp#27;[31m13:22:08,386 ERROR [org.jboss.msc.service.fail] (MSC service thread 1-5) MSC000001: Failed to start service jboss.deployment.unit."singleton.war".INSTALL: org.jboss.msc.service.StartException in service jboss.deployment.unit."singleton.war".INSTALL: WFLYSRV0153: Failed to process phase INSTALL of deployment "singleton.war"
	at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:154)
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.startService(ServiceControllerImpl.java:1948)
	at org.jboss.msc.service.ServiceControllerImpl$StartTask.run(ServiceControllerImpl.java:1881)
	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)
Caused by: java.lang.NoClassDefFoundError: org/wildfly/clustering/service/Builder
	at org.jboss.as.test.clustering.cluster.singleton.service.AbstractServiceActivator.install(AbstractServiceActivator.java:59)
	at org.jboss.as.test.clustering.cluster.singleton.service.MyServiceActivator.activate(MyServiceActivator.java:38)
	at org.jboss.as.server.deployment.service.ServiceActivatorProcessor.deploy(ServiceActivatorProcessor.java:74)
	at org.jboss.as.server.deployment.DeploymentUnitPhaseService.start(DeploymentUnitPhaseService.java:147)
	... 5 more
Caused by: java.lang.ClassNotFoundException: org.wildfly.clustering.service.Builder from [Module "deployment.singleton.war:main" from Service Module Loader]
	at org.jboss.modules.ModuleClassLoader.findClass(ModuleClassLoader.java:198)
	at org.jboss.modules.ConcurrentClassLoader.performLoadClassUnchecked(ConcurrentClassLoader.java:363)
	at org.jboss.modules.ConcurrentClassLoader.performLoadClass(ConcurrentClassLoader.java:351)
	at org.jboss.modules.ConcurrentClassLoader.loadClass(ConcurrentClassLoader.java:93)
	... 9 more