help~about jm1 and jm2

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Last nigit,
I flashed my phone to JM2 rom and root it.
then I delete Aldikoebook_samsung.apk from system\app.
I wipe it and reboot ..
I got many force close message.
In the jf7 rom I do the same operation I didn't get any problem
but in jm1 and jm2 I have the same problem.

Anyone can tell me why?..please ..

I'm sorry for my poor english..

i deleted that and some more thingies i dont like on both jm1 and jm2. no problem here...