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Just a guess, but if you managed to buy the Boxed Set before it got pulled from the store, and you also added the extension on the Forge, you will have 2 copies. I will change the name of the extension that came with the Boxed Set so you can see if this is the issue (it will have a different name). I'll fix that bug while I'm at it - thanks as always!
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Also, if you added the extension on the forge, then you can remove that one to (hopefully) get rid of the duplicate.
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I didn't get the error, so I'll check the Forge to make sure the latest version is active.