I'm getting stumped by a very basic error. I'm trying to add endpoints to a service through the WCF Service Configuration Editor, and it can't find the default output. Here's every step I can take to reproduce the error.

Add New WCF Service Application

New Project

Build Solution

Build

Edit WCF Configuration

Web.Config

Create New Service

New Service

Browse to Project Directory for Service Type

ServiceDll

Error Message

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This should work, but instead I get the following error message:

Could not load file or assembly
'file://...\emptyservice\bin\EmptyService.dll'
or one of its dependencies.
Operation is not supported.
(Exception from HRESULT: 0x80131515)

What am I doing wrong?