ERROR: list_single_divide IS NOT A VALID FUNCTION
ERROR: type error:  expected function but found null ((null)0)
  FRAME 0: [
                set(vars.position, [self.midpoint_x, self.midpoint_y]),
                [set(vars.anchor, anchor),
                [add_object(obj), set(vars.silk, obj)] where obj = object(type + '.silk', x, y, facing, {'x_1' -> midpoint_x+vars.spinneret[0], 'y_1' -> midpoint_y+vars.spinneret[1], 'x_2' -> midpoint_x+anchor[0], 'y_2' -> midpoint_y+anchor[1]})
                ] where anchor = solid_point([0,-8]),
                set(vars.low, list_subtract(list_single_divide(solid_point([0,16]), 1.2), [0, 20])),
                schedule(5, fire_event('ambush'))
                ]
  FRAME 1: set(vars.low, list_subtract(list_single_divide(solid_point([0,16]), 1.2), [0, 20]))
  FRAME 2: list_subtract(list_single_divide(solid_point([0,16]), 1.2), [0, 20])
  FRAME 3: list_single_divide(solid_point([0,16]), 1.2)
FORMULA: data/functions.cfg 187: map(range(size(list_one)), 'index', list_one[index] + list_two[index])
game: src/variant.cpp:83: type_error::type_error(const std::string&): Assertion `false' failed.
Aborted