Crash on iPad 1

My son loved this app very much! However he cannot enjoy it any more since I upgraded to the latest version on my iPad 1 -- it is always crash when open any item in the app. It seems working well on my friends iPad 2. I tried delete and install again but it still crash.

JILI FU about ABC Alphabet Phonics - Alphabet Ordering, ABC Song, Letters Matching and Phonics Sound