Invalid operation error while calling webservice

[Niranjan]

I am trying to call a webservice.
following is the error that i got
/******/
System.InvalidO perationExcepti on: Missing parameter: sOCrp.
at
System.Web.Serv ices.Protocols. ValueCollection ParameterReader .Read(NameValue Collection collection)
at System.Web.Serv ices.Protocols. UrlParameterRea der.Read(HttpRe quest
request)
at System.Web.Serv ices.Protocols. HttpServerProto col.ReadParamet ers()
at System.Web.Serv ices.Protocols. WebServiceHandl er.Invoke()
at System.Web.Serv ices.Protocols. WebServiceHandl er.CoreProcessR equest()
/******/

The webservice call is successfully returning expected value when i invoke
within say 5 or 10 mins. if i invoke after 20 or 30 minutes i am getting the
above error. The same time, I am getting out of memory error being logged in
event log.

can anyone help me

[Elena Kharitidi]

RE: Invalid operation error while calling webservice

Do you own the webservice implementation?
Can you post the service description for the webservice and or the actual
asmx, so we can take look?

Thanks,
Elena