Problems in the Web Services Explorer

Hi! I'm trying to test a WSDL file. When I am in the actions pane, invoke a WSDL Operation Section, I filled out the fields and then clicked Go. In the status pane, it appeared the following:
IWAB0135E An unexpected error has occurred.
404
Not Found

To Run this i have even started my Websphere 6.0 server and IDE is RAD 6.1

Thanks for the previous responses.

It strongly suggests that the SOAP web service endpoint is not listening at the URL that is specified as the "location" attribute of the {http://schemas.xmlsoap.org/wsdl/soap/}address element inside the {http://schemas.xmlsoap.org/wsdl/}service element of the WSDL file.

thanks for the reply it helped me alot but there is one more error i am facing is mentioned below.

IWAB0379E Unable to open file:/C:/Documents and Settings/vgedala/vgedala_CaCommAuto/Mercury1st_PVOB/PhoenixClientWeb/WebContent/WEB-INF/wsdl/DMSPrintWebServices.wsdl.
IWAB0135E An unexpected error has occurred.
WSDLException
WSDLException: faultCode=INVALID_WSDL: : Element or attribute do not match QName production: QName::=(NCName':')?NCName.

This error came up when i changed the address url inside the WSDL.
I double checked the Url it is working fine and the response is "And now... Some Services".

Please help me whether i need to generate client for this WSDL again from starting or else can i just change the areas where the url need to be edited i.e(ibm-webservicesclient-bnd.xmi, ibm-webservicesclient-ext.xmi, ServiceLocator).

Thanks for the help in advance.

HI,
I am Running one simple webservice application.

after invoking the method by giving the parameters,
I am getting one error like

IWAB0135E An unexpected error has occurred.
java.net.SocketException
Connection reset

What kind of error is this...

Help me out