ngrinder_agent启动问题 400 请求报错 

@nGrinderChina 你好，想跟你请教个问题：在启动ngrinder_agent的时候，出现以下错误信息，连不上/127.0.0.1:16001。
$ ./run_agent.sh  2013-07-16 15:43:45,371 INFO  org.ngrinder.infra.AgentConfig:     System Environment:  NGRINDER_AGENT_HOME= 2013-07-16 15:43:45,378 INFO  org.ngrinder.infra.AgentConfig:     Java Sytem Property:  ngrinder.agent.home= 2013-07-16 15:43:45,378 INFO  org.ngrinder.infra.AgentConfig: Finally NGRINDER_AGENT_HOME is resolved as /home/gaoshen/.ngrinder_agent 2013-07-16 15:43:45,400 TRACE org.ngrinder.common.util.PropertiesWrapper: The verbose is not defined in conf file. Use false instead. 2013-07-16 15:43:45,567 INFO  org.ngrinder.NGrinderStarter: java.library.path : ./native_lib/:/usr/local/perl/lib::/usr/java/packages/lib/i386:/lib:/usr/lib:./native_lib  2013-07-16 15:43:45,567 INFO  org.ngrinder.NGrinderStarter: - Passing mode agent 2013-07-16 15:43:45,567 INFO  org.ngrinder.NGrinderStarter: - nGrinder version 3.2.1 2013-07-16 15:43:45,591 INFO  org.ngrinder.NGrinderStarter: *************************************************** 2013-07-16 15:43:45,591 INFO  org.ngrinder.NGrinderStarter:  Start nGrinder Agent ... 2013-07-16 15:43:45,598 INFO  org.ngrinder.NGrinderStarter: with console: 127.0.0.1:16001 2013-07-16 15:43:45,598 INFO  org.ngrinder.NGrinderStarter: JVM server mode is disabled. If you turn on ngrinder.servermode in agent.conf. It will provide the better agent performance. 2013-07-16 15:43:45,929 INFO  agent controller daemon: The agent controller daemon is started. 2013-07-16 15:43:46,065 ERROR agent controller: Error while connecting to controller /127.0.0.1:16001 2013-07-16 15:43:48,186 ERROR agent controller: Error while connecting to controller /127.0.0.1:16001 2013-07-16 15:43:50,338 ERROR agent controller: Error while connecting to controller /127.0.0.1:16001 2013-07-16 15:43:52,488 ERROR agent controller: Error while connecting to controller /127.0.0.1:16001 2013-07-16 15:43:54,612 ERROR agent controller: Error while connecting to controller /127.0.0.1:16001

请问这是怎么回事，如何修改？