rocketmq dashboard acl manager error

[YiCheng-tech]

1:rocketmq dashboard acl manager error: wait response on the channel <192.0.0.0:10911> timeout
rocketmq version 4.9.4

broker logs :
2022-12-13 08:57:18 ERROR AdminBrokerThread_16 - Failed to generate a proper getBrokerClusterAclConfig response
java.lang.NullPointerException: null
at org.apache.rocketmq.broker.processor.AdminBrokerProcessor.getBrokerClusterAclConfig(AdminBrokerProcessor.java:469)
at org.apache.rocketmq.broker.processor.AdminBrokerProcessor.processRequest(AdminBrokerProcessor.java:244)
at org.apache.rocketmq.remoting.netty.AsyncNettyRequestProcessor.asyncProcessRequest(AsyncNettyRequestProcessor.java:26)
at org.apache.rocketmq.remoting.netty.NettyRemotingAbstract$1.run(NettyRemotingAbstract.java:227)
at org.apache.rocketmq.remoting.netty.RequestTask.run(RequestTask.java:80)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
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)