I’m confused.

Help: I need to set up my Code 49 to Reaper.

Hello, I need major help on setting up my Code 49 onto Reaper. I've looked at the previous post here, but alas, to no avail.
My problem is that I am always getting an error message from Reaper stating, "error opening MIDI inputs", and, "the following MIDI inputs could not be opened: Code 49 [&] MIDIIN 3." I've tried both. And, yes I did select Mackie Universal Control when setting it up.
I really don't know what else I can do. I've done what any and every combination of techniques that I was told, then again I am really new to this( I got the keyboard 2 days ago, and it's my first one). And it's sad to say that this is all really discouraging to me right now. I don't know what to do. This is basically like my last resort.
If you know of any resources to direct me to please do so, I would happily go there. Any input would be greatly appreciated.
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