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Sample code :

local hero_meta = sol.main.get_metatable("hero")

local movement=sol.movement.create("straight")
movement:set_speed(88)
movement:set_angle(3*math.pi/2)


function hero_meta:on_state_changed(state)
  print("STATE CHANGED:"..state) --triggers three times on map startup. is this the cause ?
  if state == "free"  then
    print "PULL ME DOWN"  -- this displays well
    movement:start(self) -- <-- crash
  end
end)