PuP-Pack used by no table
What it means
Some PuP-Packs in PUPVideos are not used by any installed table.
Why it happens
PUPVideos folders are named after the pack, often the ROM. A pack matching no ROM, no name written in a script and no table is probably left over from a removed table.
How Pincab Toolbox detects it
The folder holds triggers.pup or playlists.pup, and its name is neither a ROM read in a script, nor quoted text in a script, nor close to an installed table's name.
Check your own pincab
Pincab Toolbox is a free Windows scanner for Visual Pinball X and PinUP Popper. It finds and explains problems like this one. No account, no telemetry.
Download for freeCovered: Visual Pinball X (10.x) and PinUP Popper. Not covered: Future Pinball, Pinball FX, Visual Pinball 9 and the other frontends (PinballX, PinballY).