Parameter Problem

[Jue \(Jacky\) Shu]

Hi all,

When I called a service, if there is only one parameter (String), it works;
but If there are two parameters (String, String), it throws

Error invoking operation: 

java.lang.ClassCastException: org.apache.axis.attachments.AttachmentsImpl

at org.apache.axis.client.Call.invoke(Call.java:1636)

It seemed the invoke() failed before it reached the server.
I'm so confused 'cause I called the service sucessfully two days ago.
Anybody has a clue of this?

Thx a lot.