Please can someone could explain why I get this error and what to do to fix it (or what I’m doing wrong!). The steps I have taken are
- Download Source code from http://www.codeproject.com/Articles/16859/AForge-NET-open-source-framework
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Opening in VS2010 shows the references cannot be found

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Re-Add all 3 references from
PlayingCardRecognition\bin\Releaseso no further warnings

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When I try and build or Run I get the following message

The project type set as the Start-up project in that solution is of type ClassLibrary. DUe to that, the output is a dll not an executable and so, you cannot start it.
If this is an error then you can do this:
A quick and dirty fix for this, if that is the only csproj in the solution is to open the .csproj file in a text editor and change the value of the node
<ProjectGuid>to the Guid corresponding to a WinForms C# project. (That you may obtain from a google search or by creating a new project and opening the .csproj file generated by Visual Studio to find out what the GUID for that type is). (Enjoy – not many people know about this sneaky trick)BUT: the project might be a class library rightfully and then you should reference it in another project and use it that way.