Ksoap请求webservice每到trans.call(SOAP_ACTIO?报错

12-03 13:17:52.220: W/System.err(23231): org.ksoap2.transport.HttpResponseException: HTTP request failed, HTTP status: 500
12-03 13:17:52.250: W/System.err(23231): 	at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:237)
12-03 13:17:52.250: W/System.err(23231): 	at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:118)
12-03 13:17:52.250: W/System.err(23231): 	at org.ksoap2.transport.HttpTransportSE.call(HttpTransportSE.java:113)
12-03 13:17:52.250: W/System.err(23231): 	at com.android.customer.remote.IoServise.InsertEmployeesSignMsg(IoServise.java:1063)
12-03 13:17:52.250: W/System.err(23231): 	at com.android.customer.employeesign.EmployeeSignActivity$15.doInBackground(EmployeeSignActivity.java:987)
12-03 13:17:52.250: W/System.err(23231): 	at com.android.customer.employeesign.EmployeeSignActivity$15.doInBackground(EmployeeSignActivity.java:1)
12-03 13:17:52.250: W/System.err(23231): 	at android.os.AsyncTask$2.call(AsyncTask.java:287)
12-03 13:17:52.260: W/System.err(23231): 	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
12-03 13:17:52.260: W/System.err(23231): 	at java.util.concurrent.FutureTask.run(FutureTask.java:137)
12-03 13:17:52.260: W/System.err(23231): 	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
12-03 13:17:52.260: W/System.err(23231): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
12-03 13:17:52.260: W/System.err(23231): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
12-03 13:17:52.260: W/System.err(23231): 	at java.lang.Thread.run(Thread.java:856)
12-03 13:17:57.150: W/dalvikvm(23231): threadid=13: thread exiting with uncaught exception (group=0x415e12b8)

我看网上说这是线程问题的。可真不知道怎么改了