当我尝试调用远程方法时出现此异常，
2013-01-28 16:46:09,911 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:training (auth:SIMPLE) cause:org.apache.hadoop.ipc.RPC$VersionMismatch: Protocol org.apache.hadoop.hdfs.protocol.ClientProtocol version mismatch. (client = 69, server = 1)
2013-01-28 16:46:09,912 INFO org.apache.hadoop.ipc.Server: IPC Server handler 1 on 8020, call org.apache.hadoop.hdfs.protocol.ClientProtocol.getFileInfo from 192.168.140.1:55126: error: org.apache.hadoop.ipc.RPC$VersionMismatch: Protocol org.apache.hadoop.hdfs.protocol.ClientProtocol version mismatch. (client = 69, server = 1)
org.apache.hadoop.ipc.RPC$VersionMismatch: Protocol org.apache.hadoop.hdfs.protocol.ClientProtocol version mismatch. (client = 69, server = 1)
我正在使用 Cloudera CDH4 vm（版本 2.0.0-mr1-cdh4.1.2）
服务器端的 ClientProtocol 怎么会有“1”的版本？