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java.lang.IllegalArgumentException: The type [null] is not the expected [EntityType] for the key class [class entity.Region].	at org.eclipse.persistence.internal.jpa.metamodel.MetamodelImpl.entity(MetamodelImpl.java:160)	at org.eclipse.persistence.internal.jpa.querydef.AbstractQueryImpl.from(AbstractQueryImpl.java:97)	at ejb.RegionsFacade.findAll(RegionsFacade.java:49)	at sun.reflect.GeneratedMethodAccessor110.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1052)	at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1124)	at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:5367)	at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:619)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:801)	at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:571)	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doAround(SystemInterceptorProxy.java:162)	at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:144)	at sun.reflect.GeneratedMethodAccessor108.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:862)	at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:801)	at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:371)	at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:5339)	at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:5327)	at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:214)	at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)	at $Proxy241.findAll(Unknown Source)	at ejb.__EJB31_Generated__RegionsFacade__Intf____Bean__.findAll(Unknown Source)	at controller.SPOutputServlet.doWork(SPOutputServlet.java:153)	at controller.SPOutputServlet.doPost(SPOutputServlet.java:57)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:755)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)	at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1534)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:281)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)	at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)	at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)	at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:98)	at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:91)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:162)	at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:326)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:227)	at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:228)	at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:822)	at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:719)	at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1013)	at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:225)	at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)	at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)	at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)	at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)	at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)	at com.sun.grizzly.ContextTask.run(ContextTask.java:71)	at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)	at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)	at java.lang.Thread.run(Thread.java:619)