Error in engine.log.
2018-05-17 10:58:56,766-03 INFO [org.ovirt.engine.core.bll.snapshots. RemoveSnapshotCommand] (default task-31) [c4fc9663-51c1-4442-ba1b- 01e4efe8c62c] Lock Acquired to object 'EngineLock:{exclusiveLocks='[ f120d81e-db65-44b8-b239- 95d8ba3e0e31=VM]', sharedLocks=''}'
2018-05-17 10:58:56,923-03 ERROR [org.ovirt.engine.core.bll.snapshots. RemoveSnapshotCommand] (default task-31) [c4fc9663-51c1-4442-ba1b- 01e4efe8c62c] Error during ValidateFailure.: java.lang.NullPointerException
at org.ovirt.engine.core.bll.validator.storage. StorageDomainValidator. getTotalSizeForMerge( StorageDomainValidator.java: 121) [bll.jar:]
at org.ovirt.engine.core.bll.validator.storage. StorageDomainValidator. hasSpaceForMerge( StorageDomainValidator.java: 207) [bll.jar:]
at org.ovirt.engine.core.bll.validator.storage. MultipleStorageDomainsValidato r.lambda$ allDomainsHaveSpaceForMerge$0( MultipleStorageDomainsValidato r.java:128) [bll.jar:]
at org.ovirt.engine.core.bll.validator.storage. MultipleStorageDomainsValidato r.validOrFirstFailure( MultipleStorageDomainsValidato r.java:190) [bll.jar:]
at org.ovirt.engine.core.bll.validator.storage. MultipleStorageDomainsValidato r.allDomainsHaveSpaceForMerge( MultipleStorageDomainsValidato r.java:125) [bll.jar:]
at org.ovirt.engine.core.bll.snapshots. RemoveSnapshotCommand. validateStorageDomains( RemoveSnapshotCommand.java: 381) [bll.jar:]
at org.ovirt.engine.core.bll.snapshots. RemoveSnapshotCommand. validate( RemoveSnapshotCommand.java: 359) [bll.jar:]
at org.ovirt.engine.core.bll.CommandBase.internalValidate( CommandBase.java:840) [bll.jar:]
at org.ovirt.engine.core.bll.CommandBase.executeAction( CommandBase.java:390) [bll.jar:]
at org.ovirt.engine.core.bll.executor. DefaultBackendActionExecutor. execute( DefaultBackendActionExecutor. java:13) [bll.jar:]
at org.ovirt.engine.core.bll.Backend.runAction(Backend. java:516) [bll.jar:]
at org.ovirt.engine.core.bll.Backend.runActionImpl(Backend. java:498) [bll.jar:]
at org.ovirt.engine.core.bll.Backend.runAction(Backend. java:451) [bll.jar:]
at sun.reflect.GeneratedMethodAccessor1100. invoke(Unknown Source) [:1.8.0_161]
at sun.reflect.DelegatingMethodAccessorImpl. invoke( DelegatingMethodAccessorImpl. java:43) [rt.jar:1.8.0_161]
at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_161]
at org.jboss.as.ee.component.ManagedReferenceMethodIntercep tor.processInvocation( ManagedReferenceMethodIntercep tor.java:52)
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.invocation.InterceptorContext$Invocation. proceed(InterceptorContext. java:437)
at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor. delegateInterception( Jsr299BindingsInterceptor. java:70) [wildfly-weld-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor. doMethodInterception( Jsr299BindingsInterceptor. java:80) [wildfly-weld-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor. processInvocation( Jsr299BindingsInterceptor. java:93) [wildfly-weld-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.as.ee.component.interceptors. UserInterceptorFactory$1. processInvocation( UserInterceptorFactory.java: 63)
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.invocation.InterceptorContext$Invocation. proceed(InterceptorContext. java:437)
at org.ovirt.engine.core.bll.interceptors. CorrelationIdTrackerIntercepto r.aroundInvoke( CorrelationIdTrackerIntercepto r.java:13) [bll.jar:]
at sun.reflect.GeneratedMethodAccessor228. invoke(Unknown Source) [:1.8.0_161]
at sun.reflect.DelegatingMethodAccessorImpl. invoke( DelegatingMethodAccessorImpl. java:43) [rt.jar:1.8.0_161]
at java.lang.reflect.Method.invoke(Method.java:498) [rt.jar:1.8.0_161]
at org.jboss.as.ee.component.ManagedReferenceLifecycleMetho dInterceptor. processInvocation( ManagedReferenceLifecycleMetho dInterceptor.java:89)
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ejb3.component.invocationmetrics. ExecutionTimeInterceptor. processInvocation( ExecutionTimeInterceptor.java: 43) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.invocation.InterceptorContext$Invocation. proceed(InterceptorContext. java:437)
at org.jboss.weld.ejb.AbstractEJBRequestScopeActivat ionInterceptor.aroundInvoke( AbstractEJBRequestScopeActivat ionInterceptor.java:73) [weld-core-impl-2.3.5.Final. jar:2.3.5.Final]
at org.jboss.as.weld.ejb.EjbRequestScopeActivationInter ceptor.processInvocation( EjbRequestScopeActivationInter ceptor.java:83) [wildfly-weld-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor. processInvocation( ConcurrentContextInterceptor. java:45) [wildfly-ee-10.1.0.Final.jar: 10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.invocation.InitialInterceptor. processInvocation( InitialInterceptor.java:21)
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.invocation.ChainedInterceptor. processInvocation( ChainedInterceptor.java:61)
at org.jboss.as.ee.component.interceptors. ComponentDispatcherInterceptor .processInvocation( ComponentDispatcherInterceptor .java:52)
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ejb3.component.singleton. SingletonComponentInstanceAsso ciationInterceptor. processInvocation( SingletonComponentInstanceAsso ciationInterceptor.java:53) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInNoTx( CMTTxInterceptor.java:263) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.supports( CMTTxInterceptor.java:374) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.as.ejb3.tx.CMTTxInterceptor. processInvocation( CMTTxInterceptor.java:243) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ejb3.component.interceptors. CurrentInvocationContextInterc eptor.processInvocation( CurrentInvocationContextInterc eptor.java:41) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ejb3.component.invocationmetrics. WaitTimeInterceptor. processInvocation( WaitTimeInterceptor.java:47) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ejb3.security.SecurityContextInterceptor. processInvocation( SecurityContextInterceptor. java:100) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ejb3.deployment.processors. StartupAwaitInterceptor. processInvocation( StartupAwaitInterceptor.java: 22) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ejb3.component.interceptors. ShutDownInterceptorFactory$1. processInvocation( ShutDownInterceptorFactory. java:64) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ejb3.component.interceptors. LoggingInterceptor. processInvocation( LoggingInterceptor.java:67) [wildfly-ejb3-10.1.0.Final. jar:10.1.0.Final]
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.as.ee.component.NamespaceContextInterceptor. processInvocation( NamespaceContextInterceptor. java:50)
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.invocation.ContextClassLoaderInterceptor. processInvocation( ContextClassLoaderInterceptor. java:64)
at org.jboss.invocation.InterceptorContext.proceed( InterceptorContext.java:340)
at org.jboss.invocation.InterceptorContext.run( InterceptorContext.java:356)
at org.wildfly.security.manager.WildFlySecurityManager. doChecked( WildFlySecurityManager.java: 636)
at org.jboss.invocation.AccessCheckingInterceptor. processInvocation( AccessCheckingInterceptor.