no such object in table

Stack trace

java.rmi.NoSuchObjectException: no such object in table
	at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:276)
	at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:253)
	at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:162)
	at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:194)
	at java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:148)
	at com.sun.proxy.$Proxy0.doubleString(Unknown Source)
	at com.javarush.test.level32.lesson10.home01.Solution$1.run(Solution.java:32)
	at java.lang.Thread.run(Thread.java:745)