I would expect this code to cause the object e.other to fade and then be removed. But when I run it, all that is visible is e.other being removed. I have increased the transition, but still not delay. Without the losecenter function, the delay works. What am I doing wrong?

thanks in advance

function losecenter(item)
item:removeSelf()
end

function onCollision(self,e)
if e.phase=="began" then
x=e.other.x
y=e.other.y
if string.sub(e.other.name,1,6)=="center" and self.name=="boulder" then
e.other.bodyType="dynamic"
transition.to(e.other, { time=1000,alpha=.0,onComplete=losecenter(e.other)})
--the rest of the code doesn't really matter, e.other should have disappeared after if faded.
text=display.newText("+100",x,y,native.sysemfont,20)
text:setTextColor(255,255,255)
score=score+100
camera:insert(text)
transition.to( text, { time=1500, alpha=.2, x=(x-50), y=(y-50) } )
scoretext.text=score
end
end
end

Try rearranging like this and not pass any parameters in the onComplete?

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function onCollision( self, e )

     if e.phase == "began" then

             local item = e.other

             x = item.x

             y = item.y

             if string.sub( item.name, 1, 6 ) == "center" and self.name == "boulder" then

                        item.bodyType = "dynamic"
                        local function losecenter()
                                item:removeSelf()
                                item = nil

                        end
                        transition.to( item, { time = 1000, alpha = 0, onComplete = losecenter })

 
                        --the rest of the code doesn't really matter, e.other should have disappeared after if faded.

                        text = display.newText("+100", x, y, native.systemfont, 20 )
                        text:setTextColor( 255, 255, 255 )

                        score = score + 100

                        camera:insert( text )

                        transition.to( text, { time = 1500, alpha = 0.2, x = ( x - 50 ), y = (y - 50 )})

                        scoretext.text = score

             end

     end
end