PinballX game whose table file is gone
What it means
These games are in the frontend's list, but their table file is not in the system's tables folder: they may not start.
Why it happens
The table files were renamed, moved or deleted after the list was made, or the list spells a file name differently from the file on disk.
How to fix it
Put the table files back in that folder, or correct the file names in PinballX's game list for this system.
How Pincab Toolbox detects it
For Visual Pinball and Future Pinball systems, the scan reads PinballX's game lists (Databases\<system>\*.xml) and looks, in the system's tables folder, for the table file (.vpx or .vpt, or .fpt) of each enabled game. It says nothing if none of the games is found there, or if more than half are missing (the list is then taken for a catalogue).
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. Partly covered, read only: PinballX and PinballY (their settings and game lists). Not covered: Future Pinball, Pinball FX, Visual Pinball 9 and the other frontends.