App updating from apple store Crash

Hi,

I have a gamed developed for my client, Than we posted an update of the game, when users update the app it crash on device. Means on updating from last version to new version it crash. But if users delete the older version and than install new version its working perfectly fine. 

Can anyone guide me for the same, why this is happening?

Regards

Varun

Is the app looking for a persistent file that is no longer there?  Or has missing information?

Is the app looking for a persistent file that is no longer there?  Or has missing information?