Hi,
It’s not really a programming error, because there is no code involved, and in fact the error message has no impact whatsoever (or at least one I can see).
When I run the game I got this :
I’m pretty sure it’s because I’ve copied/pasted these objects and moved them around on the three (they are not children of the Tunnel object anymore), but I don’t understand what’s causing the error.
These are just dumb mesh objects, they have no script attached, they are not linked to anything, they just exist.