Webservice Error #2032: Stream Error

Hi

I am trying to access a webservice.When i try calling the service without passing parameters i get the following error
Required parameter ‘########’ not found in input arguments.

But when i pass the parameter required this is the error i get
Error #2032: Stream Error

Is it because of crossdomain.xml which i am not using ?

Please give some useful suggestions

Common reason for Stream error is malformed xml file. Try to get response xml and check it’s correctness.

P.S.
crossdomain will triger sandbox violation error, not stream error.

Best.