有哪位能告诉我这是什么意思？应该怎么去解决她？(100分)

有哪位能告诉我这是什么意思？应该怎么去解决她？[][?]
javax.ejb.ObjectNotFoundException: No such entity!
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:245)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:220)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:122)
at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown Source)
at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:138)
at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:108)
at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:77)
at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:80)
at org.jboss.proxy.ejb.HomeInterceptor.invoke(HomeInterceptor.java:198)
at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:76)
at $Proxy0.findByPrimaryKey(Unknown Source)
at untitled.LtXtWhcddmTestClient1.main(LtXtWhcddmTestClient1.java:39)

javax.ejb.ObjectNotFoundException: No such entity!
大哥，看不懂可以查词典啊。