MadMole wont jump

--PLAYER STATE SETTINGS
local STATE_IDLE = "playerStill"
local STATE_WALKING = "playerWalk"
local STATE_JUMPING = "playerJump"
local DIRECTION_LEFT = -1
local DIRECTION_RIGHT = 1

local player = loader:spriteWithUniqueName("Player")
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--BUTTON PART
local buttonJumpPress = function( event )
    if event.phase == "began" then
        if player.canJump == true then
            audio.play( boingSound, { channel= 3 } )
            player:applyLinearImpulse(0, -10, player.x, player.y)
            player:startAnimationWithUniqueName(player.state);
        elseif event.phase == "ended" then
            player:startAnimationWithUniqueName(player.state);
        end
    end
end
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--COLLISION PART
local function onLocalCollision( self, event )

    if ( event.phase == "began" ) then
            if(event.other.lhTag == LevelHelper_TAG.GROUND) then
                player.canJump = true
                player:startAnimationWithUniqueName(player.state, player)
            end

            if(event.other.lhTag == LevelHelper_TAG.GOLD) then
                score:addPoints(50)
                score:addToBag("gold_can")
                loader:removeSprite(event.other)
            end

            if(event.other.lhTag == LevelHelper_TAG.CHEST) then
                score:addPoints(200)
                score:addToBag("chest")
                loader:removeSprite(event.other)
            end

             if(event.other.lhTag == LevelHelper_TAG.KEY) then
                print( "Youve got the key " )
                score:addPoints(100)
                score:addToBag("key")
                loader:removeSprite(event.other)
             end

             if(event.other.lhTag == LevelHelper_TAG.ENEMY) then
                print("enemy colide registred")
                goToRestartMenu()
             end

             if(event.other.lhTag == LevelHelper_TAG.CHECKPOINT) then
                print("Next level please")
                player.collision = nil
                goToNextLevel()
                return
             end

        elseif ( event.phase == "ended" ) then
             if (event.other.lhTag == LevelHelper_TAG.GROUND) then
            player.canJump = false
        end
    end
end
player.collision = onLocalCollision
player:addEventListener( "collision", player )