Ah, I had forgot about that error message. That’s something that happens if you use automatic heightmap generation from tracing. Traces hit the center of all tile locations across the entire grid and add their heights to the Vector Field Array. At the same time, rotations of any actors that are hit are added to the Rotation Array. If the traces hit something other than an actor (such as terrain), Hit Actor will return false and this error message will appear. You can safely ignore the error as it does not affect the game, but I will change the toolkit so that the error no longer appears in the future. If you want to remove the error yourself, here is what to add to the Add Viewport Terrain to Arrays function in BP_GridManager (it’s in the top left part of the function’s event graph):
Well I certainly haven’t tried to yet, but I’d also be interested in hearing the results of any such attempt. Are you going to try it out, Wisdom?