Cannot add external assembly to Script task

Hi,

I have Visual Studio 2005 installed on Windows 7 machine. I'm trying to reference an external assembly in my SSIS Script task.

I've already done the following steps:

-- Copied .dll file to Windows/Microsoft.NET/Framework/v2.0.50727/ and /Framework64/v2.0.50727/ folders.

-- Added assembly to Global Assembly Cache (GAC) by using gacutil.exe tool.

-- Changed PreCompileScriptIntoBinaryCode to True.

-- Added reference to the assembly in script task.

When I run the package, I get the error "Object reference not set to an instance of an object."

I tried turning Run64BitRuntime property to false. The package still throws the same error.

Kindly advise.

Thanks!