org.hibernate.MappingException: Unknown entity: com.atlassian.crowd.model.webhook.WebhookTemplate when unregistering webhook

@4000000056c28d3c0760e0bc 2016-02-16 13:45:06,123 webhookPinger3295 INFO [crowd.manager.webhook.WebhookNotificationListenerImpl] Webhook 15990787 at URL (EDITED) has failed 351 consecutive times, first failure was on 2016-01-28 06:09:39.677
@4000000056c28d3c07633664 2016-02-16 13:45:06,123 webhookPinger3295 INFO [crowd.manager.webhook.WebhookNotificationListenerImpl] Webhook WebhookTemplate{id=15990787, endpointUrl='(EDITED)', applicationID=6, token=false, oldestFailureDate=2016-01-28 06:09:39.677, failuresSinceLastSuccess=351} is in bad standing and will be removed
@4000000056c28d3c07eb0bd4 Exception in thread "webhookPinger3295" org.hibernate.MappingException: Unknown entity: com.atlassian.crowd.model.webhook.WebhookTemplate
@4000000056c28d3c07eb0fbc 	at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1146)
@4000000056c28d3c07eb0fbc 	at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1358)
@4000000056c28d3c07eb13a4 	at org.hibernate.event.internal.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:100)
@4000000056c28d3c07eb2b14 	at org.hibernate.event.internal.DefaultDeleteEventListener.onDelete(DefaultDeleteEventListener.java:74)
@4000000056c28d3c07eb2b14 	at org.hibernate.internal.SessionImpl.fireDelete(SessionImpl.java:882)
@4000000056c28d3c07eb2b14 	at org.hibernate.internal.SessionImpl.delete(SessionImpl.java:855)
@4000000056c28d3c07eb2efc 	at com.atlassian.crowd.util.persistence.hibernate.HibernateDao.remove(HibernateDao.java:119)
@4000000056c28d3c07eb32e4 	at com.atlassian.crowd.dao.webhook.WebhookDAOHibernate.remove(WebhookDAOHibernate.java:64)
@4000000056c28d3c07eb36cc 	at com.atlassian.crowd.manager.webhook.WebhookRegistryImpl.remove(WebhookRegistryImpl.java:42)
@4000000056c28d3c07eb36cc 	at sun.reflect.GeneratedMethodAccessor187.invoke(Unknown Source)
@4000000056c28d3c07eb3ab4 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
@4000000056c28d3c07eb466c 	at java.lang.reflect.Method.invoke(Method.java:497)
@4000000056c28d3c07eb466c 	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
@4000000056c28d3c07eb466c 	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
@4000000056c28d3c07eb4a54 	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
@4000000056c28d3c07eb5224 	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
@4000000056c28d3c07eb5224 	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
@4000000056c28d3c07eb560c 	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
@4000000056c28d3c07eb7164 	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
@4000000056c28d3c07eb754c 	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
@4000000056c28d3c07eb7d1c 	at com.sun.proxy.$Proxy34.remove(Unknown Source)
@4000000056c28d3c07eb8104 	at com.atlassian.crowd.manager.webhook.WebhookNotificationListenerImpl.onPingFailure(WebhookNotificationListenerImpl.java:62)
@4000000056c28d3c07eb8104 	at sun.reflect.GeneratedMethodAccessor186.invoke(Unknown Source)
@4000000056c28d3c07eb84ec 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
@4000000056c28d3c07eb88d4 	at java.lang.reflect.Method.invoke(Method.java:497)
@4000000056c28d3c07eb88d4 	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
@4000000056c28d3c07eb8cbc 	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)
@4000000056c28d3c07eb8cbc 	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
@4000000056c28d3c07eb948c 	at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
@4000000056c28d3c07eb9874 	at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
@4000000056c28d3c07eb9874 	at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
@4000000056c28d3c07eba42c 	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
@4000000056c28d3c07eba814 	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
@4000000056c28d3c07eba814 	at com.sun.proxy.$Proxy47.onPingFailure(Unknown Source)
@4000000056c28d3c07ebabfc 	at com.atlassian.crowd.manager.webhook.WebhookNotifierRunnable.run(WebhookNotifierRunnable.java:52)
@4000000056c28d3c07ebafe4 	at com.atlassian.crowd.manager.webhook.KeyedExecutor$1.run(KeyedExecutor.java:49)
@4000000056c28d3c07ebb3cc 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
@4000000056c28d3c07ebb3cc 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
@4000000056c28d3c07ebb3cc 	at java.lang.Thread.run(Thread.java:745)