I am trying to add a database connection to my server application, and need to have a reference to System.Data.dll for that. Everything is fine when I add the reference manually.
However, everytime Unity rebuilds the project and Visual Studio 2013 prompts me to reload the project, the System.Data.dll-Reference is there, but with an exclamation mark, meaning it could not be loaded. Looking at the properties of the corrupt reference, the path is empty.
The System.Data.dll is already in the Assets/Plugins/-Folder.
How can I fix this?
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