having problem with tiled map

when i built the map in tiled map, i tried to build a collision layer (the ground)

I have set the collision layer ( the ground ) to physics:enabled to true and bodyType to static

However when i open the simulator the ground fall off screen

p.s. I have require (physics) and set gravity to ( 0, 0 ) and the ground is still falling

Also, im using dusk engine 

Thanks