Error when including widget common/lastPosts

[WIDGET] Error while querying SeeMy api

• Class : com.seemy.common.widget.output.SeeMyOutputter
• Method : query
• File : SeeMyOutputter.java
• Line : 866

org.hibernate.WrongClassException: Object with id: 1594 was not of the specified subclass: com.seemy.common.entities.item.Post (loaded object was of wrong class class com.seemy.common.entities.item.Message)

• Class : com.seemy.common.api.service.ServiceManager$MappedOperation
• Method : invoke
• File : ServiceManager.java
• Line : 356

Unknown error java.lang.reflect.InvocationTargetException

• Class : sun.reflect.GeneratedMethodAccessor371
• Method : invoke
• File : null
• Line : -1

org.hibernate.WrongClassException: Object with id: 1594 was not of the specified subclass: com.seemy.common.entities.item.Post (loaded object was of wrong class class com.seemy.common.entities.item.Message)

• Class : org.hibernate.ejb.AbstractEntityManagerImpl
• Method : throwPersistenceException
• File : AbstractEntityManagerImpl.java
• Line : 637

Object with id: 1594 was not of the specified subclass: com.seemy.common.entities.item.Post (loaded object was of wrong class class com.seemy.common.entities.item.Message)

• Class : org.hibernate.loader.Loader
• Method : instanceAlreadyLoaded
• File : Loader.java
• Line : 1243