App.Config file - Which project I must put it?

What is the exact exception you got?
Delphi Project -

System.InvalidOperationException: Could not find endpoint element with name BasicHttpBinding_IService and contract IService in the ServiceModel client configuration section.
This might be because no configuration file was found for your application, or because no endpoint element matching this name could be found in the client element’

What is the full name of the .config file?
App.config

What is the name of the assembly where you try to execute the code that loads the configuration file?
I`ve tried to load directly on HydraPlugin, but unsucessfully.

I’m suspecting that I’m using the wrong approach!
The 3 projects in Visual Studion Solution are defined as Class Library

Thank you!