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Handler Config Error on New Project Install - Cannot add duplicate collection entry...

  • Handler Config Error on New Project Install - Cannot add duplicate collection entry...
  • I've installed Sitefinity on Windows Server 2016, but after creating a new project in Project Manager and launching the site, I'm getting the error below:

    "Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'Telerik.Sitefinity.ThumbnailUploadHandler' "

    The ThumbnailUploadHandler is in the config twice but in two different spots - one in the httpHandlers node and one in the handlers node (the former is supposed to be for older versions of IIS).

    Anybody encounter this before?

    Thanks.

  • Figured it out - in the config just above where it adds the handlers there's a section that removes them. The ThumbnailUploadHandler was never removed, so I just added that line in and everything worked.