Ireport 4 + JPA + java.lang.LinkageError: loader constraint violation: when resolving interface

Ola ;

Coloquei os JARs do HIBERNATE-JPA na pasta ireport/core
Copiei os mesmo JARs para ireport/lib

Porem esta dando esse erro de incompatibilidade abaixo

Alguem pode ajudar ??

Error filling print... 

java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.persistence.EntityManagerFactory.createEntityManager()Ljavax/persistence/EntityManager;" the class loader (instance of org/netbeans/StandardModule$OneModuleClassLoader) of the current class, com/jaspersoft/ireport/designer/connection/EJBQLConnection, and the class loader (instance of org/netbeans/MainImpl$BootClassLoader) for resolved class, javax/persistence/EntityManagerFactory, have different Class objects for the type javax/persistence/EntityManager used in the signature null 

java.lang.LinkageError: loader constraint violation: when resolving interface method "javax.persistence.EntityManagerFactory.createEntityManager()Ljavax/persistence/EntityManager;" the class loader (instance of org/netbeans/StandardModule$OneModuleClassLoader) of the current class, com/jaspersoft/ireport/designer/connection/EJBQLConnection, and the class loader (instance of org/netbeans/MainImpl$BootClassLoader) for resolved class, javax/persistence/EntityManagerFactory, have different Class objects for the type javax/persistence/EntityManager used in the signature     at com.jaspersoft.ireport.designer.connection.EJBQLConnection.getEntityManager(EJBQLConnection.java:134)     at com.jaspersoft.ireport.designer.compiler.IReportCompiler.run(IReportCompiler.java:950)     at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:572)     at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:997) 

Print not filled. Try to use an EmptyDataSource...

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