Help with this error in WUP Installer GX2

I am trying to install a Wii game in the Wii U menu through WUP Installer GX2. I have already installed some games and everything was fine. But now I see this error: Not a game, game update, DLC

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I keep getting this error when trying to install games with WUP Installer GX2. I followed everything I found online but still dont know how to get rid of this. I just

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