c# - Visual Studio "Could not load file or assembly. Operation is not supported" error in Release mode

Question

I have a small project in C# that uses two external dll files. One is the Redmine.Net.Api.dll and the other is NLog.dll. I'm using Visual Studio 2010. I added both files as Reference to my project. The problem is that when I run the project in Debug mode, it compiles, but when I switch to Release, it says:

Error 1 Could not load file or assembly 'file:///C:projectlibRedmine.Net.Api.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515) C:projectSGEN project

How can I fix this?

Answer 1

Did you download Redmine.Net.Api dll from the web? If yes, then browse to it with Windows Explorer, right click on it and choose properties. There you should click 'Unblock'. It might have been blocked for some reasons.