Best error message ever?

Most error messages are cryptic at best, so coming across this pearl from Castle Windsor was a breath of fresh air!

System.Exception: Looks like you forgot to register the http module Castle.MicroKernel.Lifestyle.PerWebRequestLifestyleModule Add '<add name="PerRequestLifestyle" type="Castle.MicroKernel.Lifestyle.PerWebRequestLifestyleModule, Castle.Windsor" />' to the <httpModules> section on your web.config. If you're running IIS7 in Integrated Mode you will need to add it to <modules> section under <system.webServer> at Castle.MicroKernel.Lifestyle.PerWebRequestLifestyleManager.Resolve(CreationContext context)

Not only does it tell you what is wrong, but also how to fix it. Kudos to the Castle team.

UPDATE: Now with even more detail!

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