Thanks, I'll look into it... arguments checking is a relatively new thing compared to how long the YaruFPS code base has been around. I don't remember exactly how the script works, it might be that it uses the same argument signature as the other collide scripts but doesn't actually USE all the arguments.
Yeah, I looked into the code and there's commented-out code that used argument0 in the script. Change the first line into "var a = argument0, b = argument1;" (instead of "var a = argument1;") and the error should be fixed. (The collision scripts need a certain format because they're called using script_execute() depending on the object's terrain type, but not every script uses both arguments)
