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java.lang.AssertionError: 	at org.apache.cassandra.locator.TokenMetadata.getTokens(TokenMetadata.java:474)	at org.apache.cassandra.service.StorageService.getTokens(StorageService.java:2263)	at org.apache.cassandra.service.StorageService.getTokens(StorageService.java:2252)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at sun.reflect.misc.Trampoline.invoke(MethodUtil.java:71)	at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java:275)	at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:112)	at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:46)	at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:237)	at com.sun.jmx.mbeanserver.PerInterface.getAttribute(PerInterface.java:83)	at com.sun.jmx.mbeanserver.MBeanSupport.getAttribute(MBeanSupport.java:206)	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:647)	at com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:678)	at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1445)	at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76)	at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309)	at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401)	at javax.management.remote.rmi.RMIConnectionImpl.getAttribute(RMIConnectionImpl.java:639)	at sun.reflect.GeneratedMethodAccessor20.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:324)	at sun.rmi.transport.Transport$1.run(Transport.java:200)	at sun.rmi.transport.Transport$1.run(Transport.java:197)	at java.security.AccessController.doPrivileged(Native Method)	at sun.rmi.transport.Transport.serviceCall(Transport.java:196)	at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)	at java.security.AccessController.doPrivileged(Native Method)	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)