NAV 2015 Web client in Multitenant enviroment. Help!

Good afternoon,
I installed NAV 2015 with several tenants. Now I want to install web components to connect by Web client and gives me an error on the web.
The following appears in the Event Viewer:
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Error al acceder al sitio web Microsoft Dynamics NAV 2015 Web Client.
URL: http://localhost:8080/NAVCSS/WebClient/default.aspx
Type: System.UriFormatException
Message: Invalid URI: The hostname could not be parsed.
StackTrace:
at System.Uri.CreateThis(String uri, Boolean dontEscape, UriKind uriKind)
at Microsoft.Dynamics.Nav.Client.ConnectionEstablisher.<ReadSpnSettings>d__0.MoveNext()
at Microsoft.Dynamics.Nav.Client.ConnectionEstablisher.ReadSpnSetting()
at Microsoft.Dynamics.Nav.Client.ConnectionEstablisher.OpenConnection(ConnectionRequest connectionRequest, UserSettings& userSettings)
at Microsoft.Dynamics.Nav.Client.ServiceConnection.OpenConnection()
at Microsoft.Dynamics.Nav.Client.ServiceConnection.Initialize()
at Microsoft.Dynamics.Nav.Client.FormBuilder.BuilderSessionInitializer.OpenConnectionToServer()
at Microsoft.Dynamics.Nav.Client.FormBuilder.BuilderSessionInitializer.InitializeCore()
at Microsoft.Dynamics.Nav.Client.FormBuilder.BuilderSessionInitializer.Initialize()
at Microsoft.Dynamics.Framework.UI.UISession.Initialize()
at Microsoft.Dynamics.Nav.Client.Web.NavWebUISessionInitializer.InitializeCore(UISession session)
at Microsoft.Dynamics.Nav.WebClient.NavWebClientUISessionInitializer.InitializeCore(UISession session)
at Microsoft.Dynamics.Nav.Client.Web.NavWebUISessionInitializer.Initialize(UISession session)
at Microsoft.Dynamics.Framework.UI.Web.ShownFormTrackingUISessionInitializer.InitializeSessionAndTrackShownInitializationForms(UISession session)
at Microsoft.Dynamics.Framework.UI.Web.LogicalFormInitializer.InitializeSession(FormPropertyBag formBeingInitialized, ClientSession clientSession)
at Microsoft.Dynamics.Framework.UI.Web.LogicalFormInitializer.<>c__DisplayClass1.<Create>b__0()
at Microsoft.Dynamics.Framework.UI.LogicalOperationInvoker.InvokeAndHandleExceptions(Func`1 action, IExceptionHandler exceptionHandler)
Source: System
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In the web.config file this since the server as localhost, instance name. Default ports are.

I do not understand why this error occurs. Can you help?
thank you very much