使用http直接调用K/3 CLOUD接口时提示这个错误，请问怎么解决？
response_error:{"InnerExWrapper":{"IsEmpty":false,"Data":{},"HelpLink":null,"Message":"Exception has been thrown by the target of an invocation.","Source":null,"StackTrace":" at System.RuntimeMethodHandle._InvokeMethodFast(IRuntimeMethodInfo method, Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeType typeOwner)\r\n at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)\r\n at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)\r\n at Kingdee.BOS.ServiceFacade.KDServiceFx.ServiceExecutor.Execute(KDServiceContext context, ServiceType svcType, String[] paraValues, SerializerProxy serializeProxy, ServiceType beginMethod)","TargetSite":null,"ExceptionType":"System.Reflection.TargetInvocationException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089","InnerException":{"IsEmpty":false,"Data":{},"HelpLink":null,"Message":"Value cannot be null.\r\nParameter name: key","Source":null,"StackTrace":"\r\nServer stack trace: \r\n at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)\r\n at Kingdee.BOS.App.Core.MetadataXmlReader.LoadFromCache(String id, Boolean bGetBaseObject, Int32 modelTypeId)\r\n at Kingdee.BOS.App.Core.MetadataXmlReader.Load(String id, Boolean runtime, Boolean loadEmbedRefObject, Boolean getBaseObject, Int32 modeltypeId, Boolean isLoadSubObject)\r\n at Kingdee.BOS.App.Core.MetaDataService.Load(Context ctx, String id, String layoutViewId, Boolean bRuntime)\r\n\r\nException rethrown at [0]: \r\n at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)\r\n at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)\r\n at Kingdee.BOS.Contracts.IMetaDataService.Load(Context ctx, String id, String layoutViewId, Boolean bRuntime)\r\n at Kingdee.BOS.ServiceHelper.MetaDataServiceHelper.Load(Context ctx, String id, String layoutViewId, Boolean bRuntime)\r\n at Kingdee.BOS.WebApi.FormService.WebApiServiceCall.ExcuteSpecialOperation(Context ctx, String formId, String data, Int64 opId)\r\n at Kingdee.BOS.WebApi.ServicesStub.DynamicFormService.Save(String formid, String data)","TargetSite":null,"ExceptionType":"System.ArgumentNullException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089","InnerException":null}},"ClassName":"Kingdee.BOS.ServiceFacade.ServiceException","Message":"Value cannot be null.\r\nParameter name: key","Data":null,"InnerException":null,"HelpURL":null,"StackTraceString":" at Kingdee.BOS.ServiceFacade.KDServiceFx.ServiceExecutor.Execute(KDServiceContext context, ServiceType svcType, String[] paraValues, SerializerProxy serializeProxy, ServiceType beginMethod)\r\n at Kingdee.BOS.ServiceFacade.KDServiceFx.ExecuteServiceModule.OnProcess(KDServiceContext context)\r\n at Kingdee.BOS.ServiceFacade.KDServiceFx.ModulePipeline.ExcuteRequest(KDServiceContext context)\r\n at Kingdee.BOS.ServiceFacade.KDServiceFx.RequestExcuteRuntime.BeginRquest(RequestExtractor requestExtractor, WebContext webCtx)\r\n at Kingdee.BOS.ServiceFacade.KDServiceFx.RequestExcuteRuntime.StartRequest(RequestExtractor requestExtractor, WebContext context)\r\n at Kingdee.BOS.ServiceFacade.KDServiceFx.KDSVCHandler.ExecuteRequest(WebContext ctx, RequestExtractor requestExtractor)\r\n at Kingdee.BOS.ServiceFacade.KDServiceFx.KDSVCHandler.ProcessRequestInternal(WebContext webCtx, RequestExtractor requestExtractor)","RemoteStackTraceString":null,"RemoteStackIndex":0,"ExceptionMethod":"8\nExecute\nKingdee.BOS.ServiceFacade.KDServiceFx, Version=6.0.413.1, Culture=neutral, PublicKeyToken=null\nKingdee.BOS.ServiceFacade.KDServiceFx.ServiceExecutor\nSystem.String Execute(Kingdee.BOS.ServiceFacade.KDServiceFx.KDServiceContext, Kingdee.BOS.ServiceFacade.KDServiceFx.ServiceType, System.String[], Kingdee.BOS.ServiceFacade.SerializerProxy, Kingdee.BOS.ServiceFacade.KDServiceFx.ServiceType)","HResult":-2147467259,"Source":"Kingdee.BOS.ServiceFacade.KDServiceFx","WatsonBuckets":null,"_httpCode":500}
没有使用.net开发，使用的是delphi 的idhttp 和VB6.0 这gmww，有没有高人可以帮忙解决的
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