Exception while connecting to webservice

An endpoint configuration section for contract 'ServiceReference1.IImportExport' could not be loaded because more than one endpoint configuration for that contract was found. Please indicate the preferred endpoint configuration section by name.

   at System.ServiceModel.Description.ConfigLoader.LookupChannel(ContextInformation configurationContext, String configurationName, ContractDescription contract, EndpointAddress address, Boolean wildcard, Boolean useChannelElementKind, ServiceEndpoint& serviceEndpoint)

   at System.ServiceModel.ChannelFactory.InitializeEndpoint(String configurationName, EndpointAddress address)

   at System.ServiceModel.ChannelFactory`1..ctor(String endpointConfigurationName, EndpointAddress remoteAddress)

   at System.ServiceModel.EndpointTrait`1.CreateSimplexFactory()

   at System.ServiceModel.ClientBase`1.CreateChannelFactoryRef(EndpointTrait`1 endpointTrait)

   at System.ServiceModel.ClientBase`1.InitializeChannelFactoryRef()

   at System.ServiceModel.ClientBase`1..ctor()

   at SpiraDemo.ServiceReference1.ImportExportClient..ctor() in D:\testprogramme\SpiraDemo\Service References\ServiceReference1\Reference.cs:line 9030

   at SpiraDemo.Form1.button1_Click(Object sender, EventArgs e) in D:\testprogramme\SpiraDemo\Form1.cs:line 22

   at System.Windows.Forms.Control.OnClick(EventArgs e)

   at System.Windows.Forms.Button.OnClick(EventArgs e)

   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)

   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)

   at System.Windows.Forms.Control.WndProc(Message& m)

   at System.Windows.Forms.ButtonBase.WndProc(Message& m)

   at System.Windows.Forms.Button.WndProc(Message& m)

   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)

   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

   at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

   at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)

   at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)

   at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)

   at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)

   at System.Windows.Forms.Application.Run(Form mainForm)

   at SpiraDemo.Program.Main() in D:\testprogramme\SpiraDemo\Program.cs:line 18

   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)

   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)

   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()

   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)

   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)

   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

   at System.Threading.ThreadHelper.ThreadStart()