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Error when trying to add refference


When i try to add the "LgLcd.dll" as a refference in my project within visual studio c# 2010 i get the following error:
A reference to "C:\Users*\Documents\Visual Studio 2010\Projects***\LgLcd.dll" could not be added. Please make sure that the file is accessible, and that it is a valid assembly or COM component.
Do you have any idea on how to fix this issue ? :) Got a hole croud waiting for me to finish up a applet to League of legends.
  • Thanks, appreciate the effort on this project.