predefined type 'xxx' is defined in multiple assemblies in the global alias

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I am getting the following warning and error message for a C# 2008 application I am working on:
Warning 17 The predefined type System.Runtime.CompilerServices.ExtensionAttribute is defined in multiple assemblies in the global alias;<br/>
using definition from c:Program Files (x86)NLog.NET Framework 2.0NLog.dll sample
Error 21 The type or namespace name Nlog could not be found (are you missing a using directive or an assembly reference?) C:Sample.cs 15 7 samplef
I am getting this error message since I am trying to add the NLog open source tool to the solution file for 3 different project files in this solution.
I am completing the following task:
1. I add a reference to this dll in the references section of each proejct file.
2. I then place a using NLog statment in each proejct file.
Can you show me code and/or tell me how to fix this problem?



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