The fitgirl repack is really old now, in order to use all the current plugins and mods you'll want to upgrade to Better Repack HS2 DX R3. Here's the link:
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On the left, select "HoneySelect 2 DX" or you'll wind up playing Koikatsu. I'd suggest downloading via torrent as the multi-part zips on google or mega cause problems for many people. You only need the main game part (around 30Gb) and can skip the larger Studio part. Just unzip into new folder, run initsetting.exe, then the updater, copy over your old Userdata folder, and you're done.
What happened specifically in your case is you downloaded the latest uncensors, which require version 1.4.1 or newer of the BonesFramework plugin. The updater only updates mods, not plugins. If you update BonesFramework this problem should be fixed, but the next problem will be right around the corner due to how outdated the fitgirl pack is.