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Solution exception



Whenever I try to use a KeyboardReader with the MouseKeyboardActivityMonitor I get a runtime error:
  1. Solution exception:No se puede cargar el archivo o ensamblado 'MouseKeyboardActivityMonitor, Version=, Culture=neutral, PublicKeyToken=null' ni una de sus dependencias. El sistema no puede hallar el archivo especificado.
System can't load the file or assembly or any of its dependencies. The system can't find the specified file.

Why is this??? I can see and access the assembly file, and it is correctly included in my Visual Studio project

I am using Visual Studio 2012 and Windows XP. Could it be a problem with Windows XP? I already updated the .NET runtime libraries, so I don't really know what the problem is.

Thank you very much