Issue in SSIS Debug mode not finding EPPlus.dll


I created a new SSIS project in BIDS (Visual Studio) 2008 and created a C# script task. I set the framework to 3.5 and added a reference to EPPlus.dll. I am getting the following error when attempting to execute in debug mode:

Error: System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IO.FileNotFoundException: Could not load file or assembly 'EPPlus, Version=, Culture=neutral, PublicKeyToken=ea159fdaa78159a1' or one of its dependencies. The system cannot find the file specified.
File name: 'EPPlus, Version=, Culture=neutral, PublicKeyToken=ea159fdaa78159a1'
at ST_8c2e71bfe43f48e2bad80e1d40d31c52.csproj.ScriptMain.Main()

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