Crashing on iDevice

The following Code works fine on Corona, but on my iPod touch or iOS Simulator it immediately crashes.
Can anybody help me?

[lua]physics = require(“physics”)
physics.start()
physics.setGravity(0, 9.8)

local gameback = display.newImage(“space-960x640.png”)
gameback.contentWidth = display.contenWidth
gameback.contentHeight = display.contentHeight

local boom = display.newImage(“explode2.png”)
boom.x = display.contentWidth/2
physics.addBody(boom, { bounce = 0.5, radius = 33, friction = 1.0})

local boom2 = display.newImage(“explode2.png”)
boom2.x = boom.x - 105
physics.addBody(boom2, { bounce = 0.4, radius = 33, friction = 1.0})

local boom3 = display.newImage(“explode2.png”)
boom3.x = boom.x + 105
physics.addBody(boom3, { bounce = 0.3, radius = 33, friction = 1.0})

local leftWall = display.newRect(0, 0, 1, display.contentHeight )
local rightWall = display.newRect(display.contentWidth, 0, 1, display.contentHeight)
local ceiling = display.newRect(0, 0, display.contentWidth, 1 )

physics.addBody(leftWall, “static”, { bounce = 0.1} )
physics.addBody(rightWall, “static”, { bounce = 0.1} )
physics.addBody(ceiling, “static”, { bounce = 0.1} )

local floor = display.newImage(“shortButtonOver3.png”)
floor.y = display.contentHeight - floor.stageHeight/2
floor.x = display.contentWidth - floor.stageWidth/3
physics.addBody(floor, “static”, { bounce = 0.0001, friction = 1.0})

function moveBoom(event)
local boom = event.target
boom:applyLinearImpulse( 0.03, -0.2, event.x, event.y )
end

boom:addEventListener(“touch”, moveBoom)
boom2:addEventListener(“touch”, moveBoom)
boom3:addEventListener(“touch”, moveBoom)[/lua] [import]uid: 15883 topic_id: 6187 reply_id: 306187[/import]