error log

[WebGoat]

[Tue Aug 16 00:46:35 2005]  [jk_lb_worker.c (357)]: lb: All tomcat instances failed, no more workers left.
[Tue Aug 16 01:31:44 2005]  [jk_ajp_common.c (783)]: ERROR: can't receive the response message from tomcat, network problems or tomcat is down (127.0.0.1:8081), err=-1
[Tue Aug 16 01:31:44 2005]  [jk_ajp_common.c (1250)]: Tomcat is down or network problems. No response has been sent to the client (yet)
[Tue Aug 16 01:31:44 2005]  [jk_ajp_common.c (1449)]: ERROR: Receiving from tomcat failed, recoverable operation. err=0
[Tue Aug 16 01:31:44 2005]  [jk_ajp_common.c (1468)]: sending request to tomcat failed in send loop. err=0
[Tue Aug 16 01:32:04 2005]  [jk_ajp_common.c (783)]: ERROR: can't receive the response message from tomcat, network problems or tomcat is down (127.0.0.1:8081), err=-1
[Tue Aug 16 01:32:04 2005]  [jk_ajp_common.c (1250)]: Tomcat is down or network problems. No response has been sent to the client (yet)
[Tue Aug 16 01:32:04 2005]  [jk_ajp_common.c (1449)]: ERROR: Receiving from tomcat failed, recoverable operation. err=1
[Tue Aug 16 01:32:04 2005]  [jk_ajp_common.c (1468)]: sending request to tomcat failed in send loop. err=1
[Tue Aug 16 01:32:25 2005]  [jk_ajp_common.c (783)]: ERROR: can't receive the response message from tomcat, network problems or tomcat is down (127.0.0.1:8081), err=-1
[Tue Aug 16 01:32:25 2005]  [jk_ajp_common.c (1250)]: Tomcat is down or network problems. No response has been sent to the client (yet)
[Tue Aug 16 01:32:25 2005]  [jk_ajp_common.c (1449)]: ERROR: Receiving from tomcat failed, recoverable operation. err=2
[Tue Aug 16 01:32:25 2005]  [jk_ajp_common.c (1468)]: sending request to tomcat failed in send loop. err=2
[Tue Aug 16 01:32:25 2005]  [jk_ajp_common.c (1477)]: Error connecting to tomcat. Tomcat is probably not started or is listening on the wrong port. worker=tomcat1 failed errno = 61
[Tue Aug 16 01:32:45 2005]  [jk_ajp_common.c (783)]: ERROR: can't receive the response message from tomcat, network problems or tomcat is down (127.0.0.1:8083), err=-1
[Tue Aug 16 01:32:45 2005]  [jk_ajp_common.c (1250)]: Tomcat is down or network problems. No response has been sent to the client (yet)
[Tue Aug 16 01:32:45 2005]  [jk_ajp_common.c (1449)]: ERROR: Receiving from tomcat failed, recoverable operation. err=0
[Tue Aug 16 01:32:45 2005]  [jk_ajp_common.c (1468)]: sending request to tomcat failed in send loop. err=0
[Tue Aug 16 01:33:06 2005]  [jk_ajp_common.c (783)]: ERROR: can't receive the response message from tomcat, network problems or tomcat is down (127.0.0.1:8083), err=-1
[Tue Aug 16 01:33:06 2005]  [jk_ajp_common.c (1250)]: Tomcat is down or network problems. No response has been sent to the client (yet)
[Tue Aug 16 01:33:06 2005]  [jk_ajp_common.c (1449)]: ERROR: Receiving from tomcat failed, recoverable operation. err=1
[Tue Aug 16 01:33:06 2005]  [jk_ajp_common.c (1468)]: sending request to tomcat failed in send loop. err=1
[Tue Aug 16 01:33:26 2005]  [jk_ajp_common.c (783)]: ERROR: can't receive the response message from tomcat, network problems or tomcat is down (127.0.0.1:8083), err=-1
[Tue Aug 16 01:33:26 2005]  [jk_ajp_common.c (1250)]: Tomcat is down or network problems. No response has been sent to the client (yet)
[Tue Aug 16 01:33:26 2005]  [jk_ajp_common.c (1449)]: ERROR: Receiving from tomcat failed, recoverable operation. err=2
[Tue Aug 16 01:33:26 2005]  [jk_ajp_common.c (1468)]: sending request to tomcat failed in send loop. err=2
[Tue Aug 16 01:33:26 2005]  [jk_ajp_common.c (1477)]: Error connecting to tomcat. Tomcat is probably not started or is listening on the wrong port. worker=tomcat2 failed errno = 61
[Tue Aug 16 01:33:47 2005]  [jk_ajp_common.c (783)]: ERROR: can't receive the response message from tomcat, network problems or tomcat is down (127.0.0.1:8081), err=-1
[Tue Aug 16 01:33:47 2005]  [jk_ajp_common.c (1250)]: Tomcat is down or network problems. No response has been sent to the client (yet)
[Tue Aug 16 01:33:47 2005]  [jk_ajp_common.c (1449)]: ERROR: Receiving from tomcat failed, recoverable operation. err=0
[Tue Aug 16 01:33:47 2005]  [jk_ajp_common.c (1468)]: sending request to tomcat failed in send loop. err=0
[Tue Aug 16 01:34:07 2005]  [jk_ajp_common.c (783)]: ERROR: can't receive the response message from tomcat, network problems or tomcat is down (127.0.0.1:8081), err=-1
[Tue Aug 16 01:34:07 2005]  [jk_ajp_common.c (1250)]: Tomcat is down or network problems. No response has been sent to the client (yet)
[Tue Aug 16 01:34:07 2005]  [jk_ajp_common.c (1449)]: ERROR: Receiving from tomcat failed, recoverable operation. err=1
[Tue Aug 16 01:34:07 2005]  [jk_ajp_common.c (1468)]: sending request to tomcat failed in send loop. err=1

my tomcat is not down . it runs individually.

very confusing error statement. what should i do ?