LR测试webservice 脚本回放报错

使用LR9.1和LR9.5测试一个webservice，编写脚本之后，回放脚本第一次能成功，第二次就不能成功了。有时又是回放多次之后失败。脚本回放失败没有规律。9.1和9.5的版本都测试过。情况一下。哪位大哥帮忙看看。
Virtual User Script. started
Starting action vuser_init.
Web Services replay version 9.50.0 for WINXP; Toolkit: "Axis"; build 4166
LOCAL start date/time:  2010-03-19 10:26:30
Ending action vuser_init.
Running Vuser...
Starting iteration 1.
Starting action Action.
Action.c(4): Web service call "location_101" started
Action.c(4): Error: Internal error, please call customer support. Details: class java.lang.Object :
Action.c(4): Error: Internal error, please call customer support. Details: Error while retrieving body -- can not parse output parameters
Action.c(4): Error: Web service call "location_101" execution failed
Ending action Action.
Ending iteration 1.
Ending Vuser...
Starting action vuser_end.
Ending action vuser_end.
Vuser Terminated.

 

 

就是WSDL丢失了。