服务器一直报这个错， 但功能却是正常的， 不知道怎么解决
2018-09-25 16:58:03,544 WARN
[com.alibaba.dubbo.remoting.exchange.support.header.HeartBeatTask] - < [DUBBO]
Exception when heartbeat to remote channel /172.17.0.2:20888, dubbo version:
2.6.1, current host: 172.17.0.6>
java.lang.NoClassDefFoundError: com/alibaba/dubbo/remoting/exchange/Request
at
com.alibaba.dubbo.remoting.exchange.support.header.HeartBeatTask.run(HeartBeatTask.java:58)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at
java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
### Environment
* Dubbo version: 2.6.1
* Operating System version: ubuntu
* Java version: 1.8
[ Full content available at:
https://github.com/apache/incubator-dubbo/issues/2555 ]
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