Issue – when we try to call a web service using WSDL to access the URL we are receiving the below error.
System.NullReferenceException: Object reference not set to an instance of an object. at System.Runtime.Remoting.MetadataServices.WsdlGenerator.RealSchemaType.PrintMessageWsdl(TextWriter textWriter, StringBuilder sb, String indent, ArrayList refNames) at System.Runtime.Remoting.MetadataServices.WsdlGenerator.PrintWsdl() at System.Runtime.Remoting.MetadataServices.WsdlGenerator.Generate() at System.Runtime.Remoting.MetadataServices.MetaData.ConvertTypesToSchemaToStream(ServiceType[] serviceTypes, SdlType sdlType, Stream outputStream) at System.Runtime.Remoting.MetadataServices.SdlChannelSink.GenerateSdl(SdlType sdlType, IServerResponseChannelSinkStack sinkStack, ITransportHeaders requestHeaders, ITransportHeaders responseHeaders, Stream& outputStream) at System.Runtime.Remoting.MetadataServices.SdlChannelSink.ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, IMessage& responseMsg, ITransportHeaders& responseHeaders, Stream& responseStream) at System.Runtime.Remoting.Channels.Http.HttpHandlerTransportSink.HandleRequest(HttpContext context) at System.Runtime.Remoting.Channels.Http.HttpRemotingHandler.InternalProcessRequest(HttpContext context)
What steps system is taking when a web service call is made via WSDL and how the schema is getting generated. If someone having any knowledge or hands on can help us out in determining the steps system takes and also if someone is aware of the above error system is throwing.