Lead Actor Swapper script error

[DerVVulfman]

For that error message to appear, you are either using a game save that relied upon the Caterpillar script or have an event that is automatically running with movement commands reliant upon the caterpillar script.

While you would likely need to use a fresh new game after installing (due to variable changes), you may wish to look into this thread for Fukuyama's Train Actor script: https://www.save-point.org/showthread.php?tid=2705
... an English translated version exists.