Erro ao executar um WS

Fui executar um WS, passando uma URL do tipo:

http://minha_url/arquivo/meu_ws.svc

Aí gerou esse erro. Aparentemente o IIS está ok, mas....

Qualquer ajuda é bem-vinda.


Server Error in '/svgweb' Application.
--------------------------------------------------------------------------------

This collection already contains an address with scheme http. There can be at most one address per scheme in this collection.
Parameter name: item
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: This collection already contains an address with scheme http. There can be at most one address per scheme in this collection.
Parameter name: item

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[ArgumentException: This collection already contains an address with scheme http. There can be at most one address per scheme in this collection.
Parameter name: item]
System.ServiceModel.UriSchemeKeyedCollection.InsertItem(Int32 index, Uri item) +11645310
System.Collections.Generic.SynchronizedCollection`1.Add(T item) +67
System.ServiceModel.UriSchemeKeyedCollection..ctor(Uri[] addresses) +49
System.ServiceModel.ServiceHost..ctor(Type serviceType, Uri[] baseAddresses) +129
System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(Type serviceType, Uri[] baseAddresses) +28
System.ServiceModel.Activation.ServiceHostFactory.CreateServiceHost(String constructorString, Uri[] baseAddresses) +331
System.ServiceModel.HostingManager.CreateService(String normalizedVirtualPath) +693
System.ServiceModel.HostingManager.ActivateService(String normalizedVirtualPath) +42
System.ServiceModel.HostingManager.EnsureServiceAvailable(String normalizedVirtualPath) +479