The given path's format is not supported

Bonjour,

J'ai un problème lorsque je veux aller sur un site internet qui, normalement, fonctionne très bien. Il m'indique ceci :

Server Error in '/' Application.
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The given path's format is not supported.
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.NotSupportedException: The given path's format is not supported.

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:

[NotSupportedException: The given path's format is not supported.]
System.Web.Configuration.MetabaseServerConfig.MapPathCaching(String siteID, VirtualPath path) +889
System.Web.Hosting.HostingEnvironment.MapPathActual(VirtualPath virtualPath, Boolean permitNull) +320
System.Web.CachedPathData.GetConfigPathData(String configPath) +860
System.Web.CachedPathData.GetConfigPathData(String configPath) +665
System.Web.HttpContext.GetFilePathData() +46
System.Web.Configuration.HttpCapabilitiesBase.GetBrowserCapabilities(HttpRequest request) +76
System.Web.HttpRequest.get_Browser() +174
System.Web.ErrorFormatter.RequiresAdaptiveErrorReporting(HttpContext context) +177

comment je peux réusir à aller sur ce site ?