code run fine in corona simulator but not working fine on real device (android)

hello developers

i am using build 696 to build my game for android platform

i have code like this

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local box = display.newImageRect("box.png",100,40);
box.collision=boxCollisionListener -- already defined function that takes two parameters self and event
box:addEventListener("collision",box) 
physics.addBody(box, "dynamic",{isSensor = true,filter = { categoryBits = 2, maskBits = 1 }} ) 
box:addEventListener("touch",boxTouchListener)
views:1513 update:2011/12/30 9:10:41
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